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Consolidated Statement of Income (Unaudited) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Revenues        
Premiums $ 6,351 $ 6,067 $ 12,534 $ 12,048
Net investment income 598 549 1,208 1,093
Fee income 116 119 229 236
Net realized investment gains [1] 80 19 85 10
Other revenues 39 31 70 84
Total revenues 7,184 6,785 14,126 13,471
Claims and expenses        
Claims and claim adjustment expenses 4,225 3,762 8,319 7,474
Amortization of deferred acquisition costs 1,032 989 2,035 1,960
General and administrative expenses 1,045 1,054 2,041 2,049
Interest expense 92 93 181 184
Total claims and expenses 6,394 5,898 12,576 11,667
Income before income taxes 790 887 1,550 1,804
Income tax expense 195 223 338 449
Net income $ 595 $ 664 $ 1,212 $ 1,355
Net income per share        
Basic $ 2.13 $ 2.27 $ 4.32 $ 4.60
Diluted $ 2.11 $ 2.24 $ 4.28 $ 4.55
Weighted average number of common shares outstanding        
Basic 277.5 290.1 278.6 292.1
Diluted 280.0 293.6 281.2 295.6
Cash dividends declared per common share $ 0.72 $ 0.67 $ 1.39 $ 1.28
[1] Total other-than-temporary impairment (OTTI) losses were $(5) million and $(4) million for the three months ended June 30, 2017 and 2016, respectively, and $(6) million and $(32) million for the six months ended June 30, 2017 and 2016, respectively. Of total OTTI, credit losses of $(5) million and $(4) million for the three months ended June 30, 2017 and 2016, respectively, and $(7) million and $(22) million for the six months ended June 30, 2017 and 2016, respectively, were recognized in net realized investment gains. In addition, unrealized gains (losses) from other changes in total OTTI of $0 million for each of the three months ended June 30, 2017 and 2016, and $1 million and $(10) million for the six months ended June 30, 2017 and 2016, respectively, were recognized in other comprehensive income as part of changes in net unrealized gains on investment securities having credit losses recognized in the consolidated statement of income.