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Debt (Recourse Debt Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 169 | $ 188 | $ 68
LIBOR 1.75% Term Loan Due In 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt terminated amount |  | $ 343 |  |  |
8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt terminated amount | $ 228 |  |  |  |
7.375% Senior Notes Due 2021 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt terminated amount | 690 |  |  |  |
4.875% Senior Notes Due 2023 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt terminated amount |  | $ 100 |  |  |
5.5% Senior Notes Due 2024 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt terminated amount | 671 |  |  |  |
5.5% Senior Notes Due 2025 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt terminated amount | 29 |  |  |  |
Senior Notes [Member] | 4.5% Senior Notes Due 2023 [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | 500 |  |  |  |
Senior Notes [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt face amount | $ 500 |  |  |  |
Senior Notes [Member] | 4.875% Senior Notes Due 2023 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate |  | 4.875% |  |  |
Senior Notes [Member] | 5.5% Senior Notes Due 2024 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 5.50% |  |  |  |
Senior Notes [Member] | 5.5% Senior Notes Due 2025 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 5.50% |  |  |  |
Recourse Debt |  |  |  |  |
Recourse Debt Covenants and Guarantees: |  |  |  |  |
Percentage of capital stock of foreign subsidiaries securing obligations |  |  | 65.00% |  |
Covenants, sale of guarantor or its subsidiaries percentage of proceeds used to repay debt |  |  | 60.00% |  |
Covenants, sale of guarantor or its subsidiaries percentage of proceeds used to repay debt if debt to cash flow is less than 5 |  |  | 50.00% |  |
Minimum ratio of operating cash flow to interest charges |  |  | 2.5 |  |
Maximum ratio of debt to cash flow |  |  | 5.75 |  |
Unsecured Debt [Member] | 4.5% Senior Notes Due 2023 [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 4.50% |  |  |  |
Unsecured Debt [Member] | 8.0% Senior Notes Due 2020 [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 8.00% |  |  |  |
Unsecured Debt [Member] | 7.375% Senior Notes Due 2021 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 7.375% |  |  |  |
Unsecured Debt [Member] | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Stated interest rate | 4.00% |  |  |  |
Unsecured Debt [Member] | Recourse Debt | Senior Secured Term Loan due 2022 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Payment for Debt Extinguishment or Debt Prepayment Cost |  |  |  | 150 |
Loss on extinguishment of debt |  |  |  | 1 |
Unsecured Debt [Member] | Recourse Debt | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loss on extinguishment of debt | $ 125 |  |  |  |
Unsecured Debt [Member] | Recourse Debt | 4.875% Senior Notes Due 2023 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loss on extinguishment of debt |  | $ (5) |  |  |
Unsecured Debt [Member] | Recourse Debt | 5.5% Senior Notes Due 2024 [Member] [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loss on extinguishment of debt | $ 44 |  |  |  |
Parent Company [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Loss on extinguishment of debt |  |  | $ 5 | $ 171 | $ 92

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