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Equity - Dividends and Stock Repurchases (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 25, 2023
$ / shares
Feb. 28, 2023
shares
Jun. 30, 2023
$ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
shares
Jun. 30, 2023
USD ($)
transaction
$ / shares
shares
Jun. 30, 2022
USD ($)
$ / shares
Jun. 22, 2022
shares
Jan. 29, 2020
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Dividends declared per common share (USD per share) | $ / shares $ 0.90   $ 0.90 $ 0.85 $ 1.80 $ 1.62    
Remaining shares available under repurchase program (shares)     22,900,000   22,900,000      
ARS agreement transactions | transaction         2      
Shares delivered and purchased (shares)         4,300,000      
Payments for repurchase of stock | $         $ 1,501 $ 8,503    
Stock repurchased during period (shares)         3,900,000      
Uncapped ASR, December 2022                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Shares delivered and purchased (shares)   400,000            
Uncapped ASR, February 2023                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Payments for repurchase of stock | $         $ 500      
Uncapped ASR, March 2022                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Payments for repurchase of stock | $           $ 7,000    
2022 Repurchase Program                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Authorized for repurchase (shares)             30,000,000  
Shares authorized for repurchase, compared to total common stock outstanding (as a percent)             9.00%  
2020 Repurchase Program                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Authorized for repurchase (shares)               30,000,000
Shares authorized for repurchase, compared to total common stock outstanding (as a percent)               12.00%
Stock Repurchases | Uncapped ASR, March 2022                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Payments for repurchase of stock | $       $ 8,500        
Stock repurchased during period (shares)       19,000,000