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Stockholders' Equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 3,980 $ 4,118 $ 3,719 $ 3,205 $ 4,118 $ 3,205
Comprehensive income            
Net earnings 25 147 72 474 172 546
Other comprehensive income (16) (95) (56) 93 (111) 37
Comprehensive income 9 52 16 567 61 583
Stock issued (repurchased)   (115)   (40)    
Stock issued (repurchased) 19   13      
Dividends declared (83) (75) (81) (74)    
Ending balance 3,925 3,980 3,667 $ 3,719 3,925 3,667
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 7,947 7,870 7,391 6,933 7,870 6,933
Comprehensive income            
Net earnings 35 152 67 471    
Comprehensive income 35 152 67 471    
Dividends declared (80) (75) (78) (74)    
Ending balance 7,902 7,947 7,380 7,391 7,902 7,380
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 (2,715) (2,618) (2,602) (2,695) (2,618) (2,695)
Comprehensive income            
Other comprehensive income (16) (97) (55) 93 (113) 38
Comprehensive income (16) (97) (55) 93    
Ending balance (2,731) (2,715) (2,657) (2,602) (2,731) (2,657)
Treasury Stock/ Additional Paid- in-Capital            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance (2,284) (2,169) (2,099) (2,059) (2,169) (2,059)
Comprehensive income            
Stock issued (repurchased)   (115)   (40)    
Stock issued (repurchased) 19   13      
Ending balance (2,265) (2,284) (2,086) (2,099) (2,265) (2,086)
Common Stock            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 112 112 112 112 112 112
Comprehensive income            
Ending balance 112 112 112 112 112 112
Noncontrolling Interests            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 920 923 917 914 923 914
Comprehensive income            
Net earnings (10) (5) 5 3    
Other comprehensive income 0 2 (1)   2 (1)
Comprehensive income (10) (3) 4 3    
Dividends declared (3)   (3)      
Ending balance $ 907 $ 920 $ 918 $ 917 $ 907 $ 918