Income Taxes Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Abstract]
Income tax provision computed at US federal statutory tax rate	$ 264	$ 188	$ 88
Change in valuation allowance	7	39	(314)
Equity income and dividends	(25)	(41)	(20)
(Income) expense not resulting in tax impact	(16)	8	4
US tax effect of foreign earnings and dividends	48	28	10
Foreign tax credits	(66)	(33)	0
Other foreign tax rate differentials	(61)	(11)	(2)
Legislative changes	0	(71)	71
Tax-deductible interest on foreign equity investments and other related items	(3)	(3)	(76)
State income taxes, net of federal benefit	10	5	6
Other, net	(9)	3	(10)
Income tax provision (benefit)	$ 149	$ 112	$ (243)
Effective income tax rate	20.00%	21.00%	(97.00%)
US federal statutory tax rate	35.00%