Provision for Income Taxes (Schedule of Current and Deferred income Tax Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Current U.S. federal tax expense (benefit), on continuing operations	$ 160	$ 121	$ 353
Current U.S. state and local tax expense (benefit), on continuing operations	23	16	(20)
Current international tax expense (benefit), on continuing operations	677	663	482
Total current tax expense on continuing operations	860	800	815
Deferred U.S. federal tax expense (benefit), on continuing operations	(193)	(105)	(143)
Deferred U.S. state and local tax expense (benefit), on continuing operations	(65)	(46)	(4)
Deferred international tax expense (benefit), on continuing operations	24	(33)	(21)
Total deferred tax (benefit) expense on continuing operations	(234)	(184)	(168)
Provision for income taxes on continuing operations	$ 626	$ 616	$ 647