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Debt - Narrative (Details) |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 29, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2017 USD ($)
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 9,862,000,000 |  | $ 9,862,000,000 |  |  |  |  |  |  | $ 9,981,000,000
Cash paid to purchase debt |  |  |  | 1,285,000,000 | $ 1,751,000,000 |  |  |  |  |  |
Gains (losses) on restructuring of debt |  | 68,000,000 | $ 1,000,000 | 68,000,000 | (183,000,000) |  |  |  |  |  |
Deferred charges write-off |  | 54,000,000 |  | $ 54,000,000 |  |  |  |  |  |  | 63,000,000
Senior notes [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net proceeds from public offering of debt |  | 1,230,000,000 |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Term loan [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | 0 |  | $ 0 |  |  |  |  |  |  | 1,233,000,000
Debt instrument, repurchased face amount |  | 1,233,000,000 |  | 1,233,000,000 |  |  |  |  |  |  |
Cash paid to purchase debt |  |  |  | 1,285,000,000 |  |  |  |  |  |  |
Call premium |  | 52,000,000 |  | 52,000,000 |  |  |  |  |  |  |
Gains (losses) on restructuring of debt |  |  |  | 65,000,000 |  |  |  |  |  |  |
Deferred charges write-off |  | 13,000,000 |  | 13,000,000 |  |  |  |  |  |  |
Senior Notes, Sr. Secured Notes, Contingent Convertible Notes [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, repurchased face amount |  |  | $ 1,609,000,000 |  | 1,609,000,000 |  |  |  |  |  |
Cash paid to purchase debt |  |  |  |  | $ 1,751,000,000 |  |  |  |  |  |
Revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gains (losses) on restructuring of debt |  |  |  | (3,000,000) |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  | 3,000,000,000 |  | 3,000,000,000 |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | 4,000,000,000 |  | 4,000,000,000 |  |  |  |  |  |  |
Letters of credit outstanding, amount |  | $ 182,000,000 |  | $ 182,000,000 |  |  |  |  |  |  |
Leverage ratio |  | 4.00 |  | 4.00 |  |  |  |  |  | 5.50 |
Secured leverage ratio |  | 2.50 |  | 2.50 |  |  |  |  |  |  |
Fixed charge coverage ratio |  | 2.00 |  | 2.00 |  |  |  |  |  |  |
Revolving credit facility [Member] | Line of Credit [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 645,000,000 |  | $ 645,000,000 |  |  |  |  |  |  | 781,000,000
7.00% senior notes due 2024 [Member] | Senior notes [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 850,000,000 |  | $ 850,000,000 |  |  |  |  |  |  | 0
Interest rate, stated percentage |  | 7.00% |  | 7.00% |  |  |  |  |  |  |
7.5% senior notes due 2026 [Member] | Convertible debt [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 400,000,000 |  | $ 400,000,000 |  |  |  |  |  |  | 0
Interest rate, stated percentage |  | 7.50% |  | 7.50% |  |  |  |  |  |  |
8.00% Senior Secured Second Lien Notes Due 2022 [Member] | Senior notes [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  | $ 1,416,000,000 |  | $ 1,416,000,000 |  |  |  |  |  |  | $ 1,416,000,000
Interest rate, stated percentage |  | 8.00% | 8.00% | 8.00% | 8.00% |  |  |  |  |  |
Debt instrument, repurchased face amount |  |  | $ 260,000,000 |  | $ 260,000,000 |  |  |  |  |  |
Minimum [Member] | Alternative Base Rate (ABR) [Member] | Revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable rate percentage |  |  |  | 0.50% |  |  |  |  |  |  |
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable rate percentage |  |  |  | 1.50% |  |  |  |  |  |  |
Maximum [Member] | Alternative Base Rate (ABR) [Member] | Revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable rate percentage |  |  |  | 2.00% |  |  |  |  |  |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Variable rate percentage |  |  |  | 3.00% |  |  |  |  |  |  |
Forecast [Member] | Revolving credit facility [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  |  | 4.00 |  |  | 5.50 |  |
Fixed charge coverage ratio |  |  |  |  |  |  | 2.50 | 2.25 |  |  |
Subsequent Event [Member] | 8.00% Senior Secured Second Lien Notes Due 2022 [Member] | Senior notes [Member] |  |  |  |  |  |  |  |  |  |  |
Long-Term Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt redemption, percent of principal amount of notes to be redeemed | 100.00% |  |  |  |  |  |  |  |  |  |
Debt redemption, percent of aggregate amount of notes to be redeemed | 100.00% |  |  |  |  |  |  |  |  |  |
Debt instrument, repurchased face amount | $ 1,416,000,000 |  |  |  |  |  |  |  |  |  |

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