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Equity Stock Repurchases - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended	43 Months Ended
	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2019	Feb. 22, 2019	Feb. 26, 2018	Feb. 23, 2017	Feb. 24, 2016
Stock Repurchases [Line Items]
Shares Repurchased and Retired During Period, Shares	1.2		35.5
Shares Repurchased and Retired During Period, Value	$ 20	$ 20	$ 896
Weighted Average Market Price of Shares Repurchased and Retired During Period	$ 17.21		$ 25.22
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 204	$ 204
Senior Notes | 9.375% Senior Notes
Stock Repurchases [Line Items]
Interest Rate		9.375%	9.375%
Maximum | 2016 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Authorized under Stock Repurchase Program,							$ 275
Maximum | 2017 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Authorized under Stock Repurchase Program,						$ 300
Maximum | 2018 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Authorized under Stock Repurchase Program,					$ 350
Maximum | 2019 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Authorized under Stock Repurchase Program,				$ 175

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