Stockholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
		Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ 75,074	$ 75,153	$ 80,226	$ 79,593	$ 75,153	$ 79,593
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income		6		(6)		12	(7)
Other comprehensive income (loss)		(155)	(74)	(2,015)	1,007	(229)	(1,008)
Ending Balance		26,143	75,074	77,703	80,226	26,143	77,703
Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(620)		95	(620)	95
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						6	10
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income						2	(2)
Other comprehensive income (loss)						8	8
Ending Balance		(511)		103		(511)	103
Other Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			79		(53)	79	(53)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						(85)	0
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income						(1)	0
Other comprehensive income (loss)						(86)	0
Ending Balance		(7)		(53)		(7)	(53)
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(2,793)		(1,217)	(2,793)	(1,217)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	[1]					(174)	(1,011)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income						0	0
Other comprehensive income (loss)						(174)	(1,011)
Ending Balance		(1,854)		(2,228)		(1,854)	(2,228)
Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(26)		(2)	(26)	(2)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						12	0
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income						11	(5)
Other comprehensive income (loss)						23	(5)
Ending Balance		(3)		(7)		(3)	(7)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(3,434)	(3,360)	(170)	(1,177)	(3,360)	(1,177)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax						(241)	(1,001)
Amounts Reclassified from Accumulated Other Comprehensive (Loss) Income						12	(7)
Other comprehensive income (loss)		(155)	(74)	(2,015)	1,007	(229)	(1,008)
Ending Balance		$ (2,375)	$ (3,434)	$ (2,185)	$ (170)	(2,375)	$ (2,185)
Internal Reorganization [Member] | Other Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Other, Net of Tax						0
Internal Reorganization [Member] | Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Other, Net of Tax						1,113
Internal Reorganization [Member] | Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Other, Net of Tax						1,214
Internal Reorganization [Member] | Derivative [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Other, Net of Tax						0
Internal Reorganization [Member] | Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Other, Net of Tax						$ 101

[1] The cumulative translation adjustment loss for the six months ended June 30, 2018 was primarily driven by the strengthening of the U.S. Dollar ("USD") against the European Euro ("EUR") and the Brazilian Real ("BRL"). The cumulative translation adjustment gain for the six months ended June 30, 2019 was primarily driven by the weakening of the European Euro (“EUR”) against the USD.