Stockholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended						9 Months Ended
		Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ 24,801	$ 24,079	$ 24,555	$ 26,067	$ 75,074	$ 75,153	$ 24,555	$ 75,153
Amounts Reclassified from Accumulated Other Comprehensive Loss		(17)			3			12	15
Other comprehensive (loss) income		49	88	(663)	(292)	(155)	(74)	(526)	(521)
Impact of Internal Reorganizations						(55,496)
Ending Balance		24,346	24,801	24,079	25,261	26,067	75,074	24,346	25,261
Accumulated Other Comprehensive Income (Loss), Net of Tax		(3,796)			(2,667)			(3,796)	(2,667)	$ (3,270)
Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax								(10)	9
Amounts Reclassified from Accumulated Other Comprehensive Loss								4	4
Other comprehensive (loss) income								(6)	13
Accumulated Other Comprehensive Income (Loss), Net of Tax		(1,253)			(516)			(1,253)	(516)	(1,247)	$ (620)
Other Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax								2	(85)
Amounts Reclassified from Accumulated Other Comprehensive Loss								1	(1)
Other comprehensive (loss) income								3	(86)
Accumulated Other Comprehensive Income (Loss), Net of Tax		(78)			(7)			(78)	(7)	(81)	79
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax	[1]							(507)	(471)
Amounts Reclassified from Accumulated Other Comprehensive Loss								0	0
Other comprehensive (loss) income								(507)	(471)
Accumulated Other Comprehensive Income (Loss), Net of Tax		(2,451)			(2,141)			(2,451)	(2,141)	(1,944)	(2,793)
Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax								(23)	11
Amounts Reclassified from Accumulated Other Comprehensive Loss		(19)			1			7	12
Other comprehensive (loss) income								(16)	23
Accumulated Other Comprehensive Income (Loss), Net of Tax		(14)			(3)			(14)	(3)	2	(26)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(3,845)	(3,933)	(3,270)	(2,375)	(3,434)	(3,360)	(3,270)	(3,360)
Other Comprehensive (Loss) Income, before Reclassifications, Net of Tax								(538)	(536)
Amounts Reclassified from Accumulated Other Comprehensive Loss								12	15
Other comprehensive (loss) income		49	88	(663)	(292)	(155)	(74)	(526)	(521)
Impact of Internal Reorganizations						1,214
Ending Balance		(3,796)	$ (3,845)	$ (3,933)	(2,667)	$ (2,375)	$ (3,434)	(3,796)	(2,667)
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (3,796)			$ (2,667)			$ (3,796)	(2,667)	$ (3,270)	$ (3,360)
Internal Reorganization [Member] | Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Impact of Internal Reorganizations									91
Internal Reorganization [Member] | Other Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Impact of Internal Reorganizations									0
Internal Reorganization [Member] | Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Impact of Internal Reorganizations									1,123
Internal Reorganization [Member] | Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Impact of Internal Reorganizations									0
Internal Reorganization [Member] | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Impact of Internal Reorganizations									$ 1,214

[1] The cumulative translation adjustment loss for the nine months ended September 30, 2019 was primarily driven by the strengthening of the USD against the Brazilian Real (“BRL”), the European Euro (“EUR”) and the South African Rand (“ZAR”). The cumulative translation adjustment loss for the nine months ended September 30, 2020 was primarily driven by strengthening of the USD against the Brazilian Real ("BRL") and the South African Rand ("ZAR").