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Debt - Senior Notes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Repayments of senior notes |  | $ 617 | $ 1,000
Senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument face value | $ 9,100 | $ 9,100 |
Senior notes | 3.80% senior notes due September 2030 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate (as a percent) | 3.80% | 3.80% |
Offering price percentage |  | 99.794% |
Debt instrument face value |  | $ 750 |
Senior notes | 3.55% senior notes due December 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate (as a percent) | 3.55% |  | 3.55%
Offering price percentage |  |  | 99.801%
Debt instrument face value |  |  | $ 1,000
Senior notes | 5.00% senior notes due February 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate (as a percent) |  | 5.00% |
Repayments of senior notes |  | $ 600 |
Senior notes | 2.60% senior notes due December 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate (as a percent) |  |  | 2.60%
Repayments of senior notes |  |  | $ 500
Senior notes | 5.75% senior notes due January 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate (as a percent) |  |  | 5.75%
Repayments of senior notes |  |  | $ 500
Consolidated finance subsidiary co-issuer |  |  |
Debt Instrument [Line Items] |  |  |
Consolidated subsidiary, ownership interest held by the parent (as a percent) | 100.00% |  |

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