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Equity (Repurchase Programs) (Details) - USD ($)
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Feb. 29, 2020
Dec. 31, 2019
Apr. 30, 2019
Class of Stock [Line Items]              
Treasury stock (in shares) 221.0   221.0     190.0  
Treasury stock, value $ 8,125,000,000   $ 8,125,000,000     $ 7,374,000,000  
Series A Common Stock | Common Stock              
Class of Stock [Line Items]              
Treasury stock (in shares) 3.0   3.0        
Treasury stock, value $ 171,000,000   $ 171,000,000        
Series C Common Stock | Common Stock              
Class of Stock [Line Items]              
Shares repurchased (in shares) 11.2 11.6 30.7 11.6      
Treasury stock (in shares) 218.0   218.0        
Treasury stock, value $ 8,000,000,000.0   $ 8,000,000,000.0        
February 2020 Repurchase Program | Common Stock              
Class of Stock [Line Items]              
Stock repurchase program, authorized amount         $ 2,000,000,000    
February 2020 Repurchase Program | Series C Common Stock | Common Stock              
Class of Stock [Line Items]              
Shares repurchased, value $ 228,000,000 $ 300,000,000 $ 751,000,000 $ 300,000,000      
April 2019 Repurchase Program | Common Stock              
Class of Stock [Line Items]              
Stock repurchase program, authorized amount             $ 1,000,000,000