Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Other Comprehensive Income (Loss):
Tax on foreign currency translation	$ (34)	$ 0
Defined benefit plans:
Tax on amortization of prior service cost and unrecognized gains and losses included in total benefit cost	9	2
Tax on decrease (increase) in net actuarial losses	0	0
Tax on immediate recognition of prior service cost and unrecognized gains and losses due to curtailments, settlements and divestitures	0	0
Tax on deferred derivative gains (losses)	2	0
Tax on reclassification adjustment for amounts recognized in income	(1)	0
Tax on unrealized investment gains (losses)	$ 4	$ 0