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Debt (Recourse Debt Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from Lines of Credit |  |  |  |  |  | $ 2,420 | $ 2,026 | $ 1,865
Repayments of Lines of Credit |  |  |  |  |  | 2,479 | 1,735 | 2,238
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  | (186) | (169) | (188)
Recourse Debt Total | $ 3,447 |  |  | $ 3,447 |  | $ 3,447 | 3,396 |
LIBOR 1.75% Term Loan Due In 2022 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt terminated amount |  |  |  |  | $ 343 |  |  |
4.875% Senior Notes Due 2023 [Member] [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt terminated amount |  |  |  |  | $ 100 |  |  |
Senior Notes [Member] | 4.875% Senior Notes Due 2023 [Member] [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 4.875% |  |  |
Recourse Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Percentage of capital stock of foreign subsidiaries securing obligations | 65.00% |  |  | 65.00% |  | 65.00% |  |
Maximum ratio of debt to cash flow | 5.75 |  |  | 5.75 |  | 5.75 |  |
Minimum ratio of operating cash flow to interest charges | 2.5 |  |  | 2.5 |  | 2.5 |  |
Recourse Debt | LIBOR | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.75% | 1.75% |  |
Unsecured Debt [Member] | Recourse Debt | 4.875% Senior Notes Due 2023 [Member] [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  | $ 5 |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from Lines of Credit |  |  | $ 840 |  |  |  |  |
Repayments of Lines of Credit |  |  |  | $ 1,500 |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  | $ (146) | (5) | $ (171)
Recourse Debt Total | $ 3,430 |  |  | 3,430 |  | $ 3,430 |  |
Parent Company [Member] | COVID-19 Liquidity [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from Lines of Credit |  |  | 250 |  |  |  |  |
Repayments of Lines of Credit |  | $ 250 |  |  |  |  |  |
Parent Company [Member] | Other General Corporate Purposes [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from Lines of Credit |  |  | $ 590 |  |  |  |  |
Parent Company [Member] | Recourse Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from Lines of Credit |  |  |  | $ 755 |  |  |  |
Gain (Loss) on Extinguishment of Debt | $ (108) | (37) |  |  |  |  |  |
Parent Company [Member] | Recourse Debt | Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.86% |  |  | 1.86% |  | 1.86% |  |
Recourse Debt Total | $ 70 |  |  | $ 70 |  | $ 70 | 180 |
Parent Company [Member] | Recourse Debt | 3.30% Senior Notes Due 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  | 900 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.30% |  |  | 3.30% |  | 3.30% |  |
Recourse Debt Total | $ 900 |  |  | $ 900 |  | $ 900 | 0 |
Parent Company [Member] | Recourse Debt | 4.0% Senior Notes Due 2021 [Domain] [Domain] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.00% |  |  | 4.00% |  | 4.00% |  |
Recourse Debt Total | $ 0 |  |  | $ 0 |  | $ 0 | 500 |
Parent Company [Member] | Recourse Debt | 4.875% Senior Notes Due 2023 [Member] [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.875% |  |  | 4.875% |  | 4.875% |  |
Recourse Debt Total | $ 0 |  |  | $ 0 |  | $ 0 | 613 |
Parent Company [Member] | Recourse Debt | 3.95% Senior Notes Due 2030 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount |  | 700 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 3.95% |  |  | 3.95% |  | 3.95% |  |
Recourse Debt Total | $ 700 |  |  | $ 700 |  | $ 700 | 0 |
Parent Company [Member] | Recourse Debt | 4.5% Senior Notes Due 2023 [Domain] [Domain] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt terminated amount |  | $ 7 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.50% |  |  | 4.50% |  | 4.50% |  |
Recourse Debt Total | $ 0 |  |  | $ 0 |  | $ 0 | 500 |
Parent Company [Member] | Recourse Debt | 1.375% Senior Notes Due 2026 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount | $ 800 |  |  | $ 800 |  | $ 800 |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.375% |  |  | 1.375% |  | 1.375% |  |
Recourse Debt Total | $ 800 |  |  | $ 800 |  | $ 800 | 0 |
Parent Company [Member] | Recourse Debt | 2.45% Senior Notes Due 2031 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt face amount | $ 1,000 |  |  | $ 1,000 |  | $ 1,000 |  |
Debt Instrument, Interest Rate, Effective Percentage | 2.45% |  |  | 2.45% |  | 2.45% |  |
Recourse Debt Total | $ 1,000 |  |  | $ 1,000 |  | $ 1,000 | 0 |
Parent Company [Member] | Recourse Debt | 5.50% Unsecured senior notes due 2025 [Domain] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.50% |  |  | 5.50% |  | 5.50% |  |
Recourse Debt Total | $ 0 |  |  | $ 0 |  | $ 0 | 544 |
Parent Company [Member] | Recourse Debt | 6.00% senior notes due 2026 [Domain] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 6.00% |  |  | 6.00% |  | 6.00% |  |
Recourse Debt Total | $ 0 |  |  | $ 0 |  | $ 0 | 500 |
Parent Company [Member] | Recourse Debt | 5.125% Senior Notes Due 2027 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.125% |  |  | 5.125% |  | 5.125% |  |
Recourse Debt Total | $ 0 |  |  | $ 0 |  | $ 0 | 500 |
Parent Company [Member] | Recourse Debt | 5.50% Senior Unsecured Note Due 2024 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 5.50% |  |  | 5.50% |  | 5.50% |  |
Recourse Debt Total | $ 0 |  |  | $ 0 |  | $ 0 | $ 63 |

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