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Capital Stock - Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Equity [Abstract]                    
Cash dividends, per share (in dollars per share) $ 0.20 $ 0.20 $ 0.20 $ 0.57 $ 0.65 $ 0.60 $ 0.56     $ 0.15
Stock repurchase program, authorized amount $ 2,000,000,000                  
Share repurchases and retirements (in shares)               15    
Share repurchases and retirements               $ 388,000,000    
Stock repurchase program   $ 1,600,000,000           $ 1,600,000,000    
Stock repurchased during period (in shares)                 28  
Share repurchases   $ 60,000,000 $ 57,000,000 $ 271,000,000 $ 227,000,000 $ 321,000,000 $ 192,000,000   $ 740,000,000