Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ (494)
Other comprehensive (loss) income, unrecognized amounts on retirement benefits	52	$ 69	$ 16
Other comprehensive (loss) income, foreign currency translation adjustment	(680)	(314)	74
Other comprehensive (loss) income, unrealized gains on available-for-sale securities	225	(134)	263
Other comprehensive (loss) income, unrealized gains on cash flow hedges	(11)	(18)	13
Other comprehensive income (loss)	(414)	(397)	366
Ending balance	(908)	(494)
Accumulated Other Comprehensive Loss, Net [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, unrecognized amounts on retirement benefits	(490)	(559)	(575)
Balance, foreign currency translation adjustment	(412)	(98)	(172)
Beginning balance	390	524	261
Beginning balance	18	36	23
Beginning balance	(494)	(97)	(463)
Other comprehensive (loss) income, unrecognized amounts on retirement benefits	52	69	16
Other comprehensive (loss) income, foreign currency translation adjustment	(680)	(314)	74
Other comprehensive (loss) income, unrealized gains on available-for-sale securities	225	(134)	263
Other comprehensive (loss) income, unrealized gains on cash flow hedges	(11)	(18)	13
Other comprehensive income (loss)	(414)	(397)	366
Balance, unrecognized amounts on retirement benefits	(438)	(490)	(559)
Balance, foreign currency translation adjustment	(1,092)	(412)	(98)
Ending balance	615	390	524
Ending balance	7	18	36
Ending balance	$ (908)	$ (494)	$ (97)