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Debt - Recourse Debt (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Debt Instrument [Line Items] |  |  |  |  |
Gain (loss) on extinguishment of debt | $ (51) | $ (6) |  | $ (61) | $ (176)
7.375% Senior Notes Due 2021 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Redeemed notes |  |  | $ 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 |  |  | 228 |  |
Senior Notes [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issued senior notes |  |  | 500 |  |
Senior Notes [Member] | 4.5% Senior Notes Due 2023 [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Issued senior notes |  |  | $ 500 |  |
Senior Notes [Member] | 5.5% Senior Notes Due 2024 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on senior notes |  |  | 5.50% |  |
Senior Notes [Member] | 5.5% Senior Notes Due 2025 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on senior notes |  |  | 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] | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on senior notes |  |  | 4.00% |  |
Unsecured Debt [Member] | 4.5% Senior Notes Due 2023 [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate on senior notes |  |  | 4.50% |  |
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) |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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