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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, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Aggregate cost of shares repurchased | $ 10 |  | $ 472 | $ 2,410 | $ 472
January 2024 Share Repurchase Program [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Total number of shares repurchased (shares) | 7.6 |  |  | 54.1 |
Aggregate cost of shares repurchased | $ 370 |  |  | $ 2,410 |
Average price of repurchased shares, per share (usd per share) | $ 48.36 |  |  | $ 44.50 |
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 of repurchased shares, per share (usd per share) |  |  | $ 45.37 |  | $ 45.37
ASR Agreements [Member] |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Total number of shares repurchased (shares) | 7.4 | 46.5 |  | 53.9 |
Aggregate cost of shares repurchased |  | $ 2,040 |  |  |
Average price of repurchased shares, per share (usd per share) | $ 48.44 |  |  | $ 44.50 |
Accelerated share repurchases, percentage of stock received | 85.00% |  |  | 85.00% |

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