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Schedule I - Condensed Financial Information of Parent (Senior Notes and Junior Subordinated Notes) (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | $ 3,447 | $ 3,396
Less: Current maturities |  | (1) | (5)
Recourse Debt Non Current |  | 3,446 | 3,391
Unamortized (discounts)/premiums & debt issuance (costs) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | $ (41) |
Recourse Debt | LIBOR | Senior Secured Term Loan due 2022 [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Basis spread on variable rate |  | 1.75% |
Recourse Debt | LIBOR | Revolving Credit Facility [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Basis spread on variable rate | 1.75% | 1.75% |
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | $ 3,430 |
Less: Current maturities |  | 0 |
Parent Company | Unamortized (discounts)/premiums & debt issuance (costs) |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | (40) | (22)
Parent Company | Recourse Debt | Senior Secured Term Loan due 2022 [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | $ 0 | 18
Parent Company | Recourse Debt | 4.5% Senior Notes Due 2023 [Domain] [Domain] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest Rate |  | 4.50% |
Recourse Debt Total |  | $ 0 | 500
Parent Company | Recourse Debt | 4.875% Senior Notes Due 2023 [Member] [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest Rate |  | 4.875% |
Recourse Debt Total |  | $ 0 | 613
Parent Company | Recourse Debt | Revolving Credit Facility [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest Rate |  | 1.86% |
Recourse Debt Total |  | $ 70 | 180
Parent Company | Recourse Debt | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest Rate |  | 4.00% |
Recourse Debt Total |  | $ 0 | 500
Parent Company | Recourse Debt | 5.50% Senior Unsecured Note Due 2024 |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest Rate |  | 5.50% |
Recourse Debt Total |  | $ 0 | 63
Parent Company | Recourse Debt | 5.50% Unsecured senior notes due 2025 [Domain] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest Rate |  | 5.50% |
Recourse Debt Total |  | $ 0 | 544
Parent Company | Recourse Debt | 6.00% senior notes due 2026 [Domain] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest Rate |  | 6.00% |
Recourse Debt Total |  | $ 0 | 500
Parent Company | Recourse Debt Excluding Junior Subordinated Debt |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 3,430 | 3,396
Recourse Debt Non Current |  | 3,430 | $ 3,391
Debt Maturity Year One [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 1 |
Debt Maturity Year One [Member] | Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 0 |
Debt Maturity Year Two [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 3 |
Debt Maturity Year Two [Member] | Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 0 |
Debt Maturity Year Three [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 3 |
Debt Maturity Year Three [Member] | Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 0 |
Debt Maturity Year Four [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 74 |
Debt Maturity Year Four [Member] | Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 70 |
Debt Maturity Year Five [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 903 |
Debt Maturity Year Five [Member] | Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 900 |
Debt Maturity Thereafter [Member] |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | 2,504 |
Debt Maturity Thereafter [Member] | Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Recourse Debt Total |  | $ 2,500 |

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