The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Percentage of principal amount of debt redeemed.

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Subsequent Events (Details) - USD ($) shares in Millions	Apr. 15, 2019	Apr. 03, 2019	Mar. 31, 2019	Feb. 01, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Debt instrument, face amount			$ 9,978,000,000		$ 8,168,000,000
Senior notes \| 6.625% senior notes due 2020
Subsequent Event [Line Items]
Debt instrument, face amount			$ 437,000,000		437,000,000
Interest rate, stated percentage			6.625%
Senior notes \| 6.875% senior notes due 2025
Subsequent Event [Line Items]
Debt instrument, face amount			$ 700,000,000	$ 700,000,000	0
Interest rate, stated percentage			6.875%	6.875%
Senior notes \| 6.125% senior notes due 2021
Subsequent Event [Line Items]
Debt instrument, face amount			$ 548,000,000		548,000,000
Interest rate, stated percentage			6.125%
Senior notes \| 5.375% senior notes due 2021
Subsequent Event [Line Items]
Debt instrument, face amount			$ 267,000,000		$ 267,000,000
Interest rate, stated percentage			5.375%
Subsequent Event \| Senior notes
Subsequent Event [Line Items]
Amount of Notes Exchanged		884
Debt redemption, percent of principal amount of notes to be redeemed		100.00%
Debt redemption, percent of aggregate amount of notes to be redeemed		35.00%
Repayments of senior debt	$ 380,000,000
Subsequent Event \| Senior notes \| 8.00% Senior Notes due 2026
Subsequent Event [Line Items]
Debt instrument, face amount		$ 919,000,000
Interest rate, stated percentage		8.00%
Subsequent Event \| Senior notes \| 6.625% senior notes due 2020
Subsequent Event [Line Items]
Amount of Notes Exchanged		229
Subsequent Event \| Senior notes \| 6.875% senior notes due 2025
Subsequent Event [Line Items]
Amount of Notes Exchanged		134
Subsequent Event \| Senior notes \| 6.125% senior notes due 2021
Subsequent Event [Line Items]
Amount of Notes Exchanged		381
Subsequent Event \| Senior notes \| 5.375% senior notes due 2021
Subsequent Event [Line Items]
Amount of Notes Exchanged		140