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Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Consolidated Results        
Total revenues $ 10,382 $ 9,880 $ 31,085 $ 29,724
Income before income taxes 824 742 2,848 2,374
Shareholders' net income $ 560 $ 456 $ 1,971 $ 1,485
Shareholders' Net Income Per Share:        
EPS, basic $ 2.25 $ 1.78 $ 7.79 $ 5.82
EPS, diluted 2.21 1.76 7.67 5.72
Stock and Dividend Data        
Dividends Declared Per Share $ 0 $ 0 $ 0.04 $ 0.04
Special items        
Merger-related transaction costs $ 6 $ 46 $ 8 $ 108
Charges associated with litigation matters 0 25 0 25
Debt extinguishment costs $ 209 $ 0 $ 209 $ 0