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Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Consolidated Results        
Total revenues $ 11,457 $ 10,489 $ 34,314 $ 31,388
Income (loss) before income taxes 1,033 824 3,353 2,848
Shareholders' net income $ 772 $ 560 $ 2,493 $ 1,971
Shareholders' net income per share:        
EPS, basic $ 3.18 $ 2.25 $ 10.28 $ 7.79
EPS, diluted 3.14 2.21 10.14 7.67
Stock and Dividend Data        
Dividends declared per share $ 0 $ 0 $ 0.04 $ 0.04
Special items        
U.S. tax reform $ (5) $ 0 $ (5) $ 0
Debt extinguishment costs 0 209 0 209
Long-term care guaranty fund assessment     0 83
Transaction-related costs 108 6 267 8
Charges associated with litigation matters 35 0 35 0
Total special items $ 138 $ 215 $ 297 $ 300