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Background and Basis of Presentation (Share Repurchase Table) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Aggregate cost of shares repurchased | $ 260 | $ 368 | $ 732 | $ 1,451
January 2021 Share Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total number of shares repurchased (shares) |  | 8.5 |  | 29.9
Aggregate cost of shares repurchased |  | $ 368 |  | $ 1,451
Average price per share of shares repurchased (usd per share) |  | $ 43.68 |  | $ 48.60
January 2023 Share Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total number of shares repurchased (shares) | 5.9 |  | 16.3 |
Aggregate cost of shares repurchased | $ 260 |  | $ 732 |
Average price per share of shares repurchased (usd per share) | $ 44.26 |  | $ 44.97 |

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