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Condensed Consolidated Statements of Changes in Equity (Unaudited) - USD ($)
$ in Millions
Total
Preferred Stock
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Preferred Stock, Shares Issued   0          
Balance (in shares) at Dec. 31, 2018     833,985,000        
Balance at Dec. 31, 2018 $ 14,678 $ 0 $ 1 $ 9,482 $ 8,986 $ (62) $ (3,729)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net earnings 1,107       1,107    
Other comprehensive income 19         19  
Purchases of treasury stock (967)           (967)
Stock-based compensation (in shares)     0        
Stock-based compensation $ 22     7      
Stock-based compensation, treasury stock issued             32
Treasury Stock Reissued at Lower than Repurchase Price         (17)    
Common Stock, Dividends, Per Share, Declared $ 0.21            
Dividends, Common Stock, Cash $ (150)       (150)    
Other 0       13 (13)  
Balance (in shares) at Mar. 31, 2019     833,985,000        
Balance at Mar. 31, 2019 $ 14,709 $ 0 $ 1 9,489 9,939 (56) (4,664)
Preferred Stock, Shares Issued   0          
Preferred Stock, Shares Issued 750,000 750,000          
Balance (in shares) at Dec. 31, 2019 833,984,684   833,985,000        
Balance at Dec. 31, 2019 $ 15,088 $ 734 $ 1 9,537 12,117 (58) (7,243)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net earnings 286       286    
Other comprehensive income 9         9  
Purchases of treasury stock (985)           (985)
Stock-based compensation (in shares)     0        
Stock-based compensation $ (6)     (14)      
Stock-based compensation, treasury stock issued             29
Treasury Stock Reissued at Lower than Repurchase Price         (21)    
Preferred Stock, Dividends Per Share, Declared $ 14.22            
Dividends, Preferred Stock, Cash $ (11)       (11)    
Common Stock, Dividends, Per Share, Declared $ 0.22            
Dividends, Common Stock, Cash $ (135)       (135)    
Balance (in shares) at Mar. 31, 2020 833,984,684   833,985,000        
Balance at Mar. 31, 2020 $ 11,970 $ 734 $ 1 $ 9,523 9,960 $ (49) $ (8,199)
Preferred Stock, Shares Issued 750,000 750,000          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative effect of change in accounting principle $ (2,276)       $ (2,276)