(Millions of dollars)  | Equities  | Fixed Income  | Real Estate  | Other  | ||||||||||||
U.S. Pension  | ||||||||||||||||
Balance at December 31, 2010  | $  | 50  | $  | 48  | $  | 10  | $  | —  | ||||||||
Unrealized gains (losses)  | (4  | )  | (2  | )  | (2  | )  | —  | |||||||||
Realized gains (losses)  | 1  | —  | —  | —  | ||||||||||||
Purchases, issuances and settlements, net  | 30  | 17  | —  | —  | ||||||||||||
Transfers in and/or out of Level 3  | —  | (12  | )  | —  | —  | |||||||||||
Balance at December 31, 2011  | $  | 77  | $  | 51  | $  | 8  | $  | —  | ||||||||
Unrealized gains (losses)  | (4  | )  | —  | —  | (1  | )  | ||||||||||
Realized gains (losses)  | 4  | 2  | —  | —  | ||||||||||||
Purchases, issuances and settlements, net  | 21  | (4  | )  | —  | 1  | |||||||||||
Transfers in and/or out of Level 3  | —  | (4  | )  | —  | —  | |||||||||||
Balance at December 31, 2012  | $  | 98  | $  | 45  | $  | 8  | $  | —  | ||||||||
Unrealized gains (losses)  | 10  | (1  | )  | —  | —  | |||||||||||
Realized gains (losses)  | 4  | —  | —  | —  | ||||||||||||
Purchases, issuances and settlements, net  | 17  | 12  | —  | —  | ||||||||||||
Transfers in and/or out of Level 3  | —  | (2  | )  | —  | —  | |||||||||||
Balance at December 31, 2013  | $  | 129  | $  | 54  | $  | 8  | $  | —  | ||||||||
Non-U.S. Pension  | ||||||||||||||||
Balance at December 31, 2010  | $  | 1  | $  | 8  | $  | 90  | $  | 35  | ||||||||
Unrealized gains (losses)  | —  | 1  | 7  | —  | ||||||||||||
Realized gains (losses)  | —  | —  | —  | 3  | ||||||||||||
Purchases, issuances and settlements, net  | (1  | )  | —  | —  | (38  | )  | ||||||||||
Transfers in and/or out of Level 3  | —  | —  | —  | —  | ||||||||||||
Balance at December 31, 2011  | $  | —  | $  | 9  | $  | 97  | $  | —  | ||||||||
Unrealized gains (losses)  | —  | —  | 8  | —  | ||||||||||||
Realized gains (losses)  | —  | —  | —  | —  | ||||||||||||
Purchases, issuances and settlements, net  | —  | (1  | )  | (1  | )  | —  | ||||||||||
Transfers in and/or out of Level 3  | —  | (3  | )  | —  | —  | |||||||||||
Balance at December 31, 2012  | $  | —  | $  | 5  | $  | 104  | $  | —  | ||||||||
Unrealized gains (losses)  | —  | —  | 7  | —  | ||||||||||||
Realized gains (losses)  | —  | —  | —  | —  | ||||||||||||
Purchases, issuances and settlements, net  | —  | 16  | —  | —  | ||||||||||||
Transfers in and/or out of Level 3  | —  | —  | —  | —  | ||||||||||||
Balance at December 31, 2013  | $  | —  | $  | 21  | $  | 111  | $  | —  | ||||||||