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Debt - Recourse Debt (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 01, 2017
Debt Instrument [Line Items] |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  | $ (6) | $ (12) | $ (176) | $ 5 |
7.375% Senior Notes Due 2021 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redeemed notes | $ 276 |  |  | 690 |  |
5.5% Senior Notes Due 2024 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redeemed notes |  | 671 |  |  |  |
5.5% Senior Notes Due 2025 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redeemed notes |  | $ 29 |  |  |  |
8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redeemed notes | $ 24 |  |  | $ 228 |  |
Senior Notes [Member] | Convertible Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued senior notes |  |  | 517 |  | 517 |
Senior Notes [Member] | LIBOR 2.00% Senior Notes Due in 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Issued senior notes |  |  | 525 |  | $ 525 |
Senior Notes [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  | 4.00% |  | 4.00% |  |
Issued senior notes |  | $ 500 |  | $ 500 |  |
Senior Notes [Member] | 4.5% Senior Notes Due 2023 [Domain] [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  | 4.50% |  | 4.50% |  |
Issued senior notes |  | $ 500 |  | $ 500 |  |
Senior Notes [Member] | 5.5% Senior Notes Due 2024 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  | 5.50% |  | 5.50% |  |
Senior Notes [Member] | 5.5% Senior Notes Due 2025 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  | 5.50% |  | 5.50% |  |
Unsecured Debt [Member] | 7.375% Senior Notes Due 2021 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  | 7.375%
Unsecured Debt [Member] | 8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate on senior notes |  |  |  |  |  | 8.00%
Unsecured Debt [Member] | Recourse Debt [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  | $ (125) |  |
Unsecured Debt [Member] | Recourse Debt [Member] | 5.5% Senior Notes Due 2024 [Member] [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  | $ (44) |  |
Unsecured Debt [Member] | Recourse Debt [Member] | 8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | (47) |  |  |
Secured Debt [Member] | Recourse Debt [Member] | LIBOR 2.00% Senior Notes Due in 2022 [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ (6) |  |  |
London Interbank Offered Rate (LIBOR) [Member] | LIBOR 2.00% Senior Notes Due in 2022 [Member] | Recourse Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  |  | 2.00% |  |

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