Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income before non-controlling interests	$ 1,636	$ 1,497	$ 1,385
Other comprehensive income (loss), before tax:
Foreign currency translation adjustments	(639)	(527)	(86)
Unrealized investment income	1	0	1
Gain (loss) related to pension/post-retirement plans	337	(1,085)	1,213
Other comprehensive (loss) income, before tax	(301)	(1,612)	1,128
Income tax expense (credit) on other comprehensive (loss) income	72	(386)	442
Other comprehensive (loss) income, net of tax	(373)	(1,226)	686
Comprehensive income	1,263	271	2,071
Less: Comprehensive income attributable to non-controlling interests	37	32	28
Comprehensive income attributable to the Company	$ 1,226	$ 239	$ 2,043