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Debt (Recourse Debt Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2021 | Sep. 30, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings under the revolving credit facilities |  |  |  |  |  | $ 2,802 | $ 2,420 | $ 2,026 |  |
Repayments of Lines of Credit |  |  |  |  |  | 2,420 | 2,479 | 1,735 |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  | (78) | (186) | (169) |  |
Recourse Debt Total |  | $ 3,447 |  |  | $ 3,447 | $ 3,754 | 3,447 |  |  |
Senior Notes [Member] | Corporate and Other | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate | 2.45% |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Revolving Credit Facility due 2026 | Corporate and Other |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 1,250 |  |  |  |  |  |  |  |  |
Senior Notes [Member] | Revolving Credit Facility due 2024 | Corporate and Other |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt face amount |  |  |  |  |  |  |  |  | $ 1,000 |
Senior Notes [Member] | 1.375% Senior Notes Due 2026 | Corporate and Other |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount | $ 798 |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 1.375% Senior Notes Due 2026 | Corporate and Other | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate | 1.375% |  |  |  |  |  |  |  |  |
Debt face amount | $ 800 |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 1.375% Senior Notes Due 2026 | Corporate and Other | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 1.375% |
Debt face amount |  |  |  |  |  |  |  |  | $ 800 |
Senior Notes [Member] | 2.45% Senior Notes Due 2031 | Corporate and Other |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount | 997 |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 2.45% Senior Notes Due 2031 | Corporate and Other | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt face amount | $ 1,000 |  |  |  |  |  |  |  |  |
Senior Notes [Member] | 2.45% Senior Notes Due 2031 | Corporate and Other | Unsecured Debt [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  |  | 2.45% |
Debt face amount |  |  |  |  |  |  |  |  | $ 1,000 |
Recourse Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of capital stock of foreign subsidiaries securing obligations |  |  |  |  |  | 65.00% |  |  |  |
Maximum ratio of debt to cash flow |  |  |  |  |  | 5.75 |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings under the revolving credit facilities |  |  |  | $ 840 |  |  |  |  |  |
Repayments of Lines of Credit |  |  |  |  | 1,500 |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  |  |  |  |  | $ 0 | (146) | $ (5) |  |
Recourse Debt Total |  |  |  |  |  | 3,729 |  |  |  |
Parent Company [Member] | COVID-19 Liquidity [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings under the revolving credit facilities |  |  |  | 250 |  |  |  |  |  |
Repayments of Lines of Credit |  |  | $ 250 |  |  |  |  |  |  |
Parent Company [Member] | Other General Corporate Purposes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings under the revolving credit facilities |  |  |  | $ 590 |  |  |  |  |  |
Parent Company [Member] | Recourse Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings under the revolving credit facilities |  |  |  |  | 755 |  |  |  |  |
Gain (Loss) on Extinguishment of Debt |  | (108) | (37) |  |  |  |  |  |  |
Parent Company [Member] | Recourse Debt | Revolving Credit Facility [Member] | Revolving Facility 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Recourse Debt Total |  | 70 |  |  | 70 | $ 365 | 70 |  |  |
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% |  |  |  |
Recourse Debt Total |  | 900 |  |  | 900 | $ 900 | 900 |  |  |
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% |  |  |  |  |  |
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% |  |  |  |  |  |
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% |  |  |  |
Recourse Debt Total |  | 700 |  |  | 700 | $ 700 | 700 |  |  |
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%
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% | 1.375% |  |  |
Recourse Debt Total |  | $ 800 |  |  | $ 800 | $ 800 | $ 800 |  |  |
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% | 2.45% |  |  |
Recourse Debt Total |  | $ 1,000 |  |  | $ 1,000 | $ 1,000 | $ 1,000 |  |  |
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%
Parent Company [Member] | Recourse Debt | 6.00% senior notes due 2026 [Domain] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  | 6.00%
Parent Company [Member] | Recourse Debt | 5.125% Senior Notes Due 2027 [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  | 5.125%
Parent Company [Member] | Recourse Debt | Revolving Credit Facility due 2026 | Revolving Facility 2026 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Recourse Debt Total |  |  |  |  |  | $ 365 |  |  |  |
Parent Company [Member] | Recourse Debt | 5.50% Senior Unsecured Note Due 2024 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  |  |  |  |  |  | 5.50%

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