Incomes Taxes (Income tax (benefit) provision) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Expense (Benefit) [Abstract]
United States, Current Federal Tax Expense (Benefit)	$ (18)	$ (101)	$ 11
United States, Deferred Federal Income Tax Expense (Benefit)	(464)	(204)	(182)
Current Foreign Tax Expense (Benefit)	114	204	115
Deferred Foreign Income Tax Expense (Benefit)	(64)	41	(4)
Current State and Local Tax Expense (Benefit)	(1)	(5)	(4)
Deferred State and Local Income Tax Expense (Benefit)	(3)	1	3
Current Income Tax Expense (Benefit)	95	98	122
Deferred Income Tax Expense (Benefit)	(531)	(162)	(183)
Income Tax Expense (Benefit)	$ (436)	$ (64)	$ (61)