2013 | 2012 | ||||||
(in millions) | |||||||
Balance at beginning of year | $ | 188 | $ | 173 | |||
Accretion expense | 9 | 9 | |||||
Revisions in estimated cash flows (a) | 172 | 3 | |||||
Foreign currency exchange impact | (12 | ) | 5 | ||||
Liabilities settled | (7 | ) | (2 | ) | |||
Balance at end of year (b) | $ | 350 | $ | 188 | |||
(a) | Reflects revised assumptions regarding expected future costs of abandonments at Union Gas. |
(b) | Amounts included in Deferred Credits and Other Liabilities in the Consolidated Balance Sheets. |