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Share-Based Compensation Performance Unit Activity (Details) - USD ($) $ / shares in Units, shares in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 13, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted-average grant date fair value of other-than-options additional disclosures [Rollforward]
Non-vested, beginning balance		$ 0	$ 0	$ 0
Non-vested, ending balance				$ 0	$ 0
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		$ 22,000,000		$ 52,000,000	$ 84,000,000
Performance units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period			3 years
Non-vested equity instruments other than options [Roll Forward]
Non-vested, beginning balance	0	4,014	4,014
Granted	0	0
Vested		(3,033)
Forfeited		(981)
Non-vested, ending balance	0	0	0	4,014
Weighted-average grant date fair value of other-than-options additional disclosures [Rollforward]
Non-vested, beginning balance	$ 0	$ 4.99	$ 4.99
Granted	0	0		$ 4.57	$ 6.06
Vested		4.79
Forfeited		5.63
Non-vested, ending balance	$ 0	$ 0	$ 0	$ 4.99
Equity Awards Granted, Vested and Exercised		6,000			145
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		$ 95,000			$ 1,000,000