Schedule II - Valuation and Qualifying Accounts and Allowances (Details) - USD ($) $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Bad Debt Expense		$ 4	$ 5
Inventory Valuation Reserves	$ 0	0	305	$ 635	$ 265
Accounts Receivable, Net of Allowance for Uncollectible Accounts of $0 at December 31, 2019 and $123 at December 31, 2018	1,241		1,130
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
of Period	0	294	329	129
Expense (a)				238
Recoveries (b)		(6)	(17)	0
Other (c) (d)		(292)	(23)	(38)
Period (e)		0	294	329
Valuation allowance on deferred tax assets [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
of Period	1,222	1,702	1,887	1,738
Expense (a)	(56)	(480)	(166)	158
Recoveries (b)	0	0	0	0
Other (c) (d)	0	0	(19)	(9)
Period (e)	1,166	1,222	1,702	1,887
SEC Schedule, 12-09, Reserve, Inventory [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Expense (a)	0	163	86	545
Recoveries (b)	0	(4)	(6)	(5)
Other (c) (d)	0	(464)	(410)	(170)
Short [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
of Period	0	123	156	129
Expense (a)	0	4	5	80
Recoveries (b)	0	(3)	(15)	0
Other (c) (d)	0	(124)	(23)	(53)
Period (e)	0	0	123	156
Long [Member] | SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
of Period	$ 0	171	173	0
Expense (a)		0	0	158
Recoveries (b)		(3)	(2)	0
Other (c) (d)		(168)	0	(15)
Period (e)		$ 0	$ 171	$ 173