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 | ||