Income Tax (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ (29)	$ (200)	$ 121
State and local	6	(1)	21
Foreign	846	614	203
Subtotal	823	413	345
Deferred:
Federal	(244)	2,241	643
State and local	(1)	(3)	(7)
Foreign	(450)	142	129
Subtotal	(695)	2,380	765
Current and Deferred:
Provision for income tax expense (benefit)	$ 128	$ 2,793	$ 1,110