Income Taxes (Schedule of Provision for Income Taxes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Contingency [Line Items]
United States federal	$ 79	$ 227	$ 100
United States state and local	29	41	33
International	75	178	372
Total current income tax expense	183	446	505
United States federal	(52)	(12)	(16)
United States state and local	(4)	(9)	(9)
International	79	(18)	(139)
Total deferred income tax benefit	23	(39)	(164)
Total income tax expense	206	407	341
Interest expense and penalties included in other income (expense)	$ 12	$ (4)	$ 36