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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, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Aggregate cost of shares repurchased | $ 507 | $ 325 | $ 1,083 | $ 650
January 2021 Share Repurchase Program [Member] |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Total number of shares repurchased (shares) | 10.1 | 6.6 | 21.4 | 13.5
Aggregate cost of shares repurchased | $ 507 | $ 325 | $ 1,083 | $ 650
Average price per share of shares repurchased (usd per share) | $ 50.35 | $ 49.21 | $ 50.53 | $ 48.09

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