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Financing Activities - Equity Securities (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Jul. 01, 2021 | Feb. 28, 2018
Securities Financing Transaction [Line Items] |  |  |  |  |
Common Stock Aggregate Sales Price |  |  |  |  | $ 1,000
Common stock issued |  |  | 0 |  |
Stock Repurchase Program, Authorized Amount |  |  |  | $ 3,000 |
Treasury stock acquired |  | 9,600,000 | 9,600,000 |  |
Maximum Percentage Paid To Selling Agents |  |  | 2.00% |  |
Treasury Stock, Value, Acquired |  | $ 282 | $ 282 |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  | $ 1,000 | $ 1,000 |  |
Subsequent Event [Member] |  |  |  |  |
Securities Financing Transaction [Line Items] |  |  |  |  |
Treasury stock acquired | 9,400,000 |  |  |  |
Treasury Stock, Value, Acquired | $ 269 |  |  |  |

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