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Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance $ 3,925 $ 3,980 $ 4,118 $ 3,667 $ 3,719 $ 3,205 $ 4,118 $ 3,205
Comprehensive income                
Net earnings 398 25 147 364 72 474 570 910
Other comprehensive income (23) (16) (95) 55 (56) 93 (133) 92
Comprehensive income 375 9 52 419 16 567 436 1,002
Stock issued (repurchased)     (115) (54)   (40)    
Stock issued (repurchased) 55 19     13      
Dividends declared (77) (83) (75) (83) (81) (74)    
Ending balance 4,278 3,925 3,980 3,949 $ 3,667 3,719 4,278 3,949
Accounting Standards Update [Extensible List]         us-gaap:AccountingStandardsUpdate201602Member      
Revision of Prior Period, Accounting Standards Update, Adjustment                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance           61   61
Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance 7,902 7,947 7,870 7,380 $ 7,391 6,933 7,870 6,933
Comprehensive income                
Net earnings 397 35 152 358 67 471    
Comprehensive income 397 35 152 358 67 471    
Dividends declared (76) (80) (75) (79) (78) (74)    
Ending balance 8,223 7,902 7,947 7,659 7,380 7,391 8,223 7,659
Retained Earnings | Revision of Prior Period, Accounting Standards Update, Adjustment                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance           61   61
Accumulated Other Comprehensive Income (Loss)                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance (2,731) (2,715) (2,618) (2,657) (2,602) (2,695) (2,618) (2,695)
Comprehensive income                
Other comprehensive income (23) (16) (97) 54 (55) 93 (135) 92
Comprehensive income (23) (16) (97) 54 (55) 93    
Ending balance (2,754) (2,731) (2,715) (2,603) (2,657) (2,602) (2,754) (2,603)
Treasury Stock/ Additional Paid- in-Capital                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance (2,265) (2,284) (2,169) (2,086) (2,099) (2,059) (2,169) (2,059)
Comprehensive income                
Stock issued (repurchased)     (115) (54)   (40)    
Stock issued (repurchased) 54 19     13      
Ending balance (2,211) (2,265) (2,284) (2,140) (2,086) (2,099) (2,211) (2,140)
Common Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance 112 112 112 112 112 112 112 112
Comprehensive income                
Stock issued (repurchased) 1              
Ending balance 113 112 112 112 112 112 113 112
Noncontrolling Interests                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance 907 920 923 918 917 914 923 914
Comprehensive income                
Net earnings 1 (10) (5) 6 5 3    
Other comprehensive income 0   2 1 (1)   2 0
Comprehensive income 1 (10) (3) 7 4 3    
Dividends declared (1) (3)   (4) (3)      
Ending balance $ 907 $ 907 $ 920 $ 921 $ 918 $ 917 $ 907 $ 921