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Noncontrolling Interests (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Noncontrolling Interests:        
Noncontrolling interest ownership threshold (percentage) 100.00%   100.00%  
Net income attributable to noncontrolling interest $ 56 $ 47 $ 112 $ 47
Purchase of noncontrolling interest (shares) 1.2   1.3  
Purchase of noncontrolling interest (price per share) $ 326.50   $ 326.38  
Purchase price of noncontrolling interest $ 402   $ 429  
Shares held by noncontrolling shareholders (shares) 27.1   27.1  
Common Noncontrolling Interest [Member]        
Noncontrolling Interests:        
Ownership percentage held by noncontrolling interest (percentage) 10.00%   10.00%  
Net income attributable to noncontrolling interest $ 18 29 $ 36 29
Preferred Noncontrolling Interest [Member]        
Noncontrolling Interests:        
Net income attributable to noncontrolling interest $ 37 $ 18 75 $ 18
Noncontrolling Interest [Member]        
Noncontrolling Interests:        
Carrying value of noncontrolling interst purchased     290  
Pretax Impact Of Change In Subsidiary Ownership Structure     166  
Additional Paid-in Capital [Member]        
Noncontrolling Interests:        
Pretax impact of noncontrolling interest purchased     139  
Tax effect of noncontrolling interest purchased     53  
Pretax Impact Of Change In Subsidiary Ownership Structure     166  
Tax Effect Of Change In Subsidiary Ownership Structure     $ 64