Stockholders' Equity Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		4 Months Ended	8 Months Ended	12 Months Ended
		Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		$ 12,517	$ 10,196	$ 75,153	$ 79,593
Net other comprehensive income (loss)		(420)	1,289	(1,124)	(2,183)
Ending Balance		79,593	12,517	24,555	75,153
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(1,801)	(2,843)	(2,793)	(1,217)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	[1]	(490)	1,042	(274)	(1,576)
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax		0	0	0	0
Net other comprehensive income (loss)		(490)	1,042	(274)	(1,576)
Ending Balance		(1,217)	(1,801)	(1,944)	(2,793)
Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(3)	7	(26)	(2)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(2)	3	16	(19)
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax		0	(13)	12	(5)
Net other comprehensive income (loss)		(2)	(10)	28	(24)
Ending Balance		(2)	(3)	2	(26)
Unrealized gain (loss) on investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		2	2	0	0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		0	1	0	0
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax		0	(1)	0	0
Net other comprehensive income (loss)		0	0	0	0
Ending Balance		0	2	0	0
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(8,622)	(9,911)	(3,360)	(1,177)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(416)	968	(1,140)	(2,187)
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax		(4)	321	16	4
Net other comprehensive income (loss)		(420)	1,289	(1,124)	(2,183)
Ending Balance		(1,177)	(8,622)	(3,270)	(3,360)
Internal Reorganization [Member] | Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Other, Net of Tax				1,123
Internal Reorganization [Member] | Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Other, Net of Tax				0
Internal Reorganization [Member] | Unrealized gain (loss) on investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Other, Net of Tax				0
Internal Reorganization [Member] | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Other, Net of Tax				1,214
Successor Period [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		79,973
Ending Balance			79,973
Successor Period [Member] | Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(727)
Ending Balance			(727)
Successor Period [Member] | Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		0
Ending Balance			0
Successor Period [Member] | Unrealized gain (loss) on investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		0
Ending Balance			0
Successor Period [Member] | Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(757)
Ending Balance			(757)
Pension Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(6,473)	(6,720)	(620)	95
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		129	(78)	(723)	(724)
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax		(4)	325	5	9
Net other comprehensive income (loss)		125	247	(718)	(715)
Ending Balance		95	(6,473)	(1,247)	(620)
Pension Plan | Internal Reorganization [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Other, Net of Tax				91
Pension Plan | Successor Period [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[2]	(30)
Ending Balance	[2]		(30)
Other Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(347)	(357)	79	(53)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(53)	0	(159)	132
Amounts Reclassified from Accumulated Other Comprehensive Income, Net of Tax		0	10	(1)	0
Net other comprehensive income (loss)		(53)	10	(160)	132
Ending Balance		(53)	(347)	(81)	$ 79
Other Benefit Plans | Internal Reorganization [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income, Other, Net of Tax				$ 0
Other Benefit Plans | Successor Period [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	[2]	$ 0
Ending Balance	[2]		$ 0

[1] The cumulative translation adjustment losses for the year ended December 31, 2019, the year ended December 31, 2018 and the period September 1 through December 31, 2017 are primarily driven by the strengthening of the U.S. Dollar ("USD") against the Brazilian Real ("BRL") and the European Euro ("EUR"). The cumulative translation adjustment gain for the period January 1 through August 31, 2017 is primarily driven by the weakening of the USD against the EUR.

[2] In connection with the Merger, previously unrecognized prior service benefits and net losses related to EID's pension and other post employment benefit ("OPEB") plans were eliminated as a result of reflecting the balance sheet at fair value as of the date of the Merger. See Note 20 - Pension Plans and Other Post Employment Benefits, for further information regarding the pension and OPEB plans. Amounts reflected relate to DAS balances as of September 1, 2017.