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041603 - Disclosure - Pension And Other Postretirement Benefits (Change In Plan Assets Of Pension And Other Postretirement Benefits) (Details)
(http://www.exxonmobil.com/role/DisclosurePensionAndOtherPostretirementBenefitsChangeInPlanAssetsOfPensionAndOtherPostretirementBenefitsDetails)
TableDefined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000034088 (http://www.sec.gov/CIK)
Defined Benefit Plan Disclosure [Line Items]Period [Axis]
2013-01-01 - 2013-12-31
2012-01-01 - 2012-12-31
Defined Benefit Plans, Benefit Payments [Axis]Defined Benefit Plans, Benefit Payments [Axis]
Benefit Payments For Funded Plans [Member]Benefits Paid [Domain]Benefit Payments For Funded Plans [Member]Benefits Paid [Domain]
Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis]Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis]Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis]Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis]
United States Pension Plans Of U S Entity Defined Benefit [Member]Foreign Pension Plans Defined Benefit [Member]Other Postretirement Benefit Plans Defined Benefit [Member]United States Pension Plans Of U S Entity Defined Benefit [Member]Foreign Pension Plans Defined Benefit [Member]Other Postretirement Benefit Plans Defined Benefit [Member]United States Pension Plans Of U S Entity Defined Benefit [Member]Foreign Pension Plans Defined Benefit [Member]Other Postretirement Benefit Plans Defined Benefit [Member]United States Pension Plans Of U S Entity Defined Benefit [Member]Foreign Pension Plans Defined Benefit [Member]Other Postretirement Benefit Plans Defined Benefit [Member]
Fair value at January 1
 
 
 
12,632,000,000  
18,090,000,000  
581,000,000  
 
 
 
10,656,000,000  
17,117,000,000  
538,000,000  
Actual return on plan assets
 
 
 
617,000,000  
1,604,000,000  
64,000,000  
 
 
 
1,457,000,000  
1,541,000,000  
65,000,000  
Foreign exchange rate changes
 
 
 
 
(270,000,000) 
 
 
 
 
 
462,000,000  
 
Company contribution
 
 
 
101,000,000  
919,000,000  
35,000,000  
 
 
 
1,560,000,000  
1,604,000,000  
38,000,000  
Benefits paid
(2,171,000,000)1
(869,000,000)1
(60,000,000)1
 
 
 
(1,041,000,000)1
(922,000,000)1
(60,000,000)1
 
 
 
Japan restructuring and other divestments
 
 
 
 
(45,000,000) 
 
 
 
 
 
(1,696,000,000) 
 
Other
 
 
 
11,000,000  
(146,000,000) 
 
 
 
 
 
(16,000,000) 
 
Fair value at December 31
 
 
 
 
 
 
11,190,000,000  
 
19,283,000,000  
 
620,000,000  
 
 
 
 
 
 
 
12,632,000,000  
 
18,090,000,000  
 
581,000,000  
 
1: Benefit payments for funded plans.