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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 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Equity, Class of Treasury Stock [Line Items]          
Aggregate cost of shares repurchased $ 680 $ 260   $ 3,090 $ 732
January 2024 Share Repurchase Program [Member]          
Equity, Class of Treasury Stock [Line Items]          
Total number of shares repurchased (shares) 13.5     67.6  
Aggregate cost of shares repurchased $ 680     $ 3,090  
Average price of repurchased shares, per share (usd per share) $ 50.37     $ 45.68  
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 of repurchased shares, per share (usd per share)   $ 44.26     $ 44.97
ASR Agreements [Member]          
Equity, Class of Treasury Stock [Line Items]          
Total number of shares repurchased (shares)     53.9 53.9  
Average price of repurchased shares, per share (usd per share)       $ 44.50