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Noncontrolling Interests (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Noncontrolling Interests:                
Net income attributable to noncontrolling interest $ 80     $ 91     $ 216 $ 212
Distributions to noncontrolling interest 38 $ 39 $ 39 38 $ 37 $ 39    
Purchase of noncontrolling interest, net of tax (308) (148) (89) (139) (192) (118)    
Change in noncontrolling interest ownership, net of tax $ (22) (6) (7) (3) (5) (6)    
Common Noncontrolling Interest                
Noncontrolling Interests:                
Ownership percentage held by noncontrolling interest (percentage) 8.00%           8.00%  
Net income attributable to noncontrolling interest $ 43     $ 54     $ 103 $ 99
Purchase of noncontrolling interest (shares) 864,826     495,447     1,615,561 1,546,475
Purchase of noncontrolling interest (price per share) $ 391.62     $ 292.81     $ 366.76 $ 306.11
Purchase price of noncontrolling interest $ 339     $ 145     $ 593 $ 473
Preferred Noncontrolling Interest                
Noncontrolling Interests:                
Distributions to noncontrolling interest 37     37     112 112
Noncontrolling Interests                
Noncontrolling Interests:                
Distributions to noncontrolling interest 38 39 39 38 37 39    
Purchase of noncontrolling interest, net of tax (215) (111) (74) (122) (164) (90)    
Change in noncontrolling interest ownership, net of tax (87) (23) (29) (10) (23) (20) (139) (53)
Noncontrolling Interests | Common Noncontrolling Interest                
Noncontrolling Interests:                
Purchase of noncontrolling interest, net of tax (215)     (122)     (400) (376)
Additional Paid-in Capital                
Noncontrolling Interests:                
Distributions to noncontrolling interest 0 0 0 0 0 0    
Purchase of noncontrolling interest, net of tax (93) (37) (15) (17) (28) (28)    
Change in noncontrolling interest ownership, net of tax 65 $ 17 $ 22 7 $ 18 $ 14 104 39
Additional Paid-in Capital | Common Noncontrolling Interest                
Noncontrolling Interests:                
Impact of noncontrolling interest purchased $ (93)     $ (17)     $ (145) $ (73)
Maximum                
Noncontrolling Interests:                
Minority Interest Ownership Percentage Threshold 100.00%           100.00%