Share-Based Compensation Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant under Incentive Plans	4,000,000,000,000		4,000,000,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value				$ 0	$ 0
Employee Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering period			6 months
Purchase price percent				90.00%
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture				4,000,000	3,000,000
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum term (in years) that awards will be granted			10 years
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			0		0
Share-based Payment Arrangement, Option [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					1 year
Share-based Payment Arrangement, Option [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period					4 years
Restricted Stock and Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average grant date fair value		$ 0.90		$ 1.76	$ 4.26
Total fair value of awards vested during the period		$ 2		$ 17	$ 30
Restricted Stock and Restricted Stock Units (RSUs) [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Performance units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 0	$ 0	$ 0	$ 4.99
Award vesting			200.00%
Weighted-average grant date fair value	$ 0	$ 0		$ 4.57	$ 6.06
Risk-free interest rate			2.28%
Volatility rate			63.00%
Dividend yield			0.00%
Shares issued for share-based compensation awards (in shares)		6,000,000			145,000