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Equity - Equity Repurchase Program (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Oct. 28, 2021 | Apr. 01, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 3,000 |  |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 1,700 | $ 150 | $ 200 |  |
Treasury Stock, Shares, Acquired | 25,900,000 | 2,700,000 | 3,400,000 |  |
1/1/2020-12/31/2022 [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 1,500 |  |  |
Stock Repurchase Program, Increase Authorized Amount |  |  |  | $ 500 | $ 1,000
2/4/2019-12/31/2020 [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  | $ 1,000 |  |  |

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