Stockholders' Equity Stockholder's Equity (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016		Dec. 31, 2016		Dec. 31, 2015
Accumulated Other Comprehensive (Loss) Income, Net of Tax	$ (9,423)		$ (9,951)		$ (9,911)		$ (9,396)
Other comprehensive income (loss), before Reclassifications, Net of Tax	366		(670)
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	122		115
Other Comprehensive (Loss) Income, Net of Tax	488		(555)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax	(2,465)	[1]	(2,163)	[2]	(2,843)	[1]	(2,333)	[2]
Other comprehensive income (loss), before Reclassifications, Net of Tax	378	[1]	170	[2]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	0	[1]	0	[2]
Other Comprehensive (Loss) Income, Net of Tax	378	[1]	170	[2]
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax	4		(7)		7		(24)
Other comprehensive income (loss), before Reclassifications, Net of Tax	2		10
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	(5)		7
Other Comprehensive (Loss) Income, Net of Tax	(3)		17
Pension Plan [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax	(6,611)		(7,662)	[3]	(6,720)		(7,043)	[3]
Other comprehensive income (loss), before Reclassifications, Net of Tax	(15)		(762)	[3]
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	124		143	[3]
Other Comprehensive (Loss) Income, Net of Tax	109		(619)	[3]
Other Post Employment Benefit Plans [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax	(353)		(93)		(357)		22
Other comprehensive income (loss), before Reclassifications, Net of Tax	0		(79)
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	4		(36)
Other Comprehensive (Loss) Income, Net of Tax	4		(115)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive (Loss) Income, Net of Tax	2		(26)		$ 2		$ (18)
Other comprehensive income (loss), before Reclassifications, Net of Tax	1		(9)
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax	(1)		1
Other Comprehensive (Loss) Income, Net of Tax	$ 0		$ (8)

[1] The cumulative translation adjustment gain for the three months ended March 31, 2017 is primarily driven by the weakening of the U.S. dollar (USD) against the European Euro (EUR) and the Brazilian real (BRL).

[2] The cumulative translation adjustment gain for the three months ended March 31, 2016 is primarily driven by the weakening of the USD against the EUR and BRL.

[3] The Pension Benefit Plans loss recognized in other comprehensive (loss) income during the three months ended March 31, 2016 includes the impact of the re-measurement of the principal U.S. pension plan as of March 31, 2016. See Note 14 for additional information.