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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Aggregate cost of shares repurchased | $ 472 | $ 507 | $ 472 | $ 1,083
January 2021 Share Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total number of shares repurchased (shares) |  | 10.1 |  | 21.4
Aggregate cost of shares repurchased |  | $ 507 |  | $ 1,083
Average price per share of shares repurchased (usd per share) |  | $ 50.35 |  | $ 50.53
January 2023 Share Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total number of shares repurchased (shares) | 10.4 |  | 10.4 |
Aggregate cost of shares repurchased | $ 472 |  | $ 472 |
Average price per share of shares repurchased (usd per share) | $ 45.37 |  | $ 45.37 |

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