Income Tax (Income Loss from Continuing Operations Before Income Tax Expense from Domestic and Foreign Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income from continuing operations:
Domestic	$ 1,186	$ (1,496)	$ 6,869
Foreign	2,866	2,938	2,315
Income (loss) from continuing operations before provision for income tax	$ 4,052	$ 1,442	$ 9,184