Stockholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ 24,555	$ 75,153
Amounts Reclassified from Accumulated Other Comprehensive Loss		7	6
Other comprehensive (loss) income		(663)	(74)
Ending Balance		24,079	75,074
Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(1,247)	(620)
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax		(2)	(4)
Amounts Reclassified from Accumulated Other Comprehensive Loss		2	1
Other comprehensive (loss) income		0	(3)
Ending Balance		(1,247)	(623)
Other Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(81)	79
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax		3	0
Amounts Reclassified from Accumulated Other Comprehensive Loss		0	0
Other comprehensive (loss) income		3	0
Ending Balance		(78)	79
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(1,944)	(2,793)
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax	[1]	(672)	(72)
Amounts Reclassified from Accumulated Other Comprehensive Loss		0	0
Other comprehensive (loss) income		(672)	(72)
Ending Balance		(2,616)	(2,865)
Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		2	(26)
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax		1	(4)
Amounts Reclassified from Accumulated Other Comprehensive Loss		5	5
Other comprehensive (loss) income		6	1
Ending Balance		8	(25)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(3,270)	(3,360)
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax		(670)	(80)
Amounts Reclassified from Accumulated Other Comprehensive Loss		7	6
Other comprehensive (loss) income		(663)	(74)
Ending Balance		$ (3,933)	$ (3,434)

[1] The cumulative translation adjustment loss for the three months ended March 31, 2019 was primarily driven by strengthening of the USD against the European Euro (“EUR”) and the Brazilian Real (“BRL”). The cumulative translation adjustment loss for the three months ended March 31, 2020 was primarily driven by strengthening of the USD against the BRL and the South African Rand ("ZAR").