Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Tax (expense) benefit on unrecognized amounts	$ (1,600,000,000)	$ 1,800,000,000	$ 1,600,000,000
Tax expense on recognition of previously deferred amounts	$ 555,000,000	$ 469,000,000	$ 364,000,000