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Derivative Instruments (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2016	Dec. 13, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 12, 2019	Jun. 30, 2019
Derivative [Line Items]
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right	7,777,779						84,500,000
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 99.96						$ 6.43
Predecessor Capital in Excess of Par Value	$ 0			$ 0
Warrants and Rights Outstanding	0
Warrant Fair Value Adjustment	0		$ 0	(70)	$ (86)
Warrant [Member]
Derivative [Line Items]
Predecessor Capital in Excess of Par Value			31
Interest Rate Swap [Member] \| Fair Value Hedging [Member]
Derivative [Line Items]
Deferred (Gain) Loss on Discontinuation of Fair Value Hedge	0		$ 0	(8)	$ (9)	$ 0
Foreign currency forward contracts [Member]
Derivative [Line Items]
Notional amount	$ 389			435
Additional Paid-in Capital [Member]
Derivative [Line Items]
Stock Issued During Period, Shares, New Issues		84,500,000
Other Noncurrent Liabilities [Member] \| Not Designated as Hedging Instrument [Member] \| Warrant [Member]
Derivative [Line Items]
Derivative Liability, Fair Value, Gross Liability				$ 0