Consolidated Statements of Comprehensive Income Parenthetical (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Tax on foreign currency translation	$ 0	$ 0	$ 0
Tax on reclassification adjustment for amounts recognized in income	0	0	0
Defined benefit plans:
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	10	9	8
Tax on decrease (increase) in net actuarial losses	34	(54)	(26)
Tax on immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements, and divestitures	1	1	1
Tax on prior service credit (cost) from plan amendments	0	3	0
Tax on deferred derivative gains (losses)	1	0	1
Tax on reclassification adjustment for amounts recognized in income	0	(3)	2
Tax on unrealized investment gains	$ 0	$ 0	$ 0