Components of Accumulated Other Comprehensive Loss, Net (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - Accumulated other comprehensive loss, net			$ (908)
Other comprehensive income (loss), unrecognized amounts on retirement benefits	$ 40	$ (28)	62	$ (6)
Other comprehensive income (loss), foreign currency translation adjustment	(272)	263	(205)	(161)
Other comprehensive income (loss), unrealized gains on available-for-sale securities	38	116	71	282
Other comprehensive income (loss), unrealized gains on cash flow hedges	24	(7)	1	(6)
Other comprehensive income (loss)	(170)	344	(71)	109
Ending balance - Accumulated other comprehensive loss, net	(979)		(979)
Accumulated Other Comprehensive (Loss) Income, Net [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance - unrecognized amounts on retirement benefits			(438)	(490)
Beginning balance - foreign currency translation adjustment			(1,092)	(412)
Beginning balance - unrealized gains on available-for-sale securities			615	390
Beginning balance - unrealized gains on cash flow hedges			7	18
Beginning balance - Accumulated other comprehensive loss, net			(908)	(494)
Other comprehensive income (loss), unrecognized amounts on retirement benefits			62	(6)
Other comprehensive income (loss), foreign currency translation adjustment			(205)	(161)
Other comprehensive income (loss), unrealized gains on available-for-sale securities			71	282
Other comprehensive income (loss), unrealized gains on cash flow hedges			1	(6)
Other comprehensive income (loss)			(71)	109
Ending balance - unrecognized amounts on retirement benefits	(376)	(496)	(376)	(496)
Ending balance - foreign currency translation adjustment	(1,297)	(573)	(1,297)	(573)
Ending balance - unrealized gains on available-for-sale securities	686	672	686	672
Ending balance - unrealized gains on cash flow hedges	8	12	8	12
Ending balance - Accumulated other comprehensive loss, net	$ (979)	$ (385)	$ (979)	$ (385)