Income Taxes Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Income tax provision computed at US federal statutory tax rate	$ 230	$ 264	$ 188
Change in valuation allowance	27	7	39
Equity income and dividends	(31)	(25)	(41)
(Income) expense not resulting in tax impact, net	(39)	(16)	8
US tax effect of foreign earnings and dividends	42	48	28
Foreign tax credits	(187)	(66)	(33)
Other foreign tax rate differentials	(8)	(61)	(11)
Legislative changes	0	0	(71)	[1]
Tax-deductible interest on foreign equity investments and other related items	11	(3)	(3)
State income taxes, net of federal benefit	9	10	5
Other, net	(6)	(9)	3
Income tax provision (benefit)	$ 48	$ 149	$ 112
Effective income tax rate	7.00%	20.00%	21.00%
US federal statutory tax rate	35.00%

[1] Represents the impact of Miscellaneous Tax Resolutions issued by the Mexican tax authority to clarify various provisions included in the 2010 Mexican Tax Reform Bill.