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Shareholders' Equity Share Repurchases (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]      
Common shares repurchases, shares 16,000,000 14,000,000  
Common share repurchases, average price per share $ 493.79 $ 501.67  
Payments for Repurchase of Common Stock $ 8,000 $ 7,000 $ 5,000
Board authorized shares remaining 15,000,000 31,000,000