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Unaudited Consolidated Quarterly Financial Data (Detail) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Income Statements, [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premium income | $ 4,671 | $ 4,736 | $ 4,681 | $ 4,691 | $ 4,591 | $ 4,636 | $ 4,706 | $ 4,745 | $ 18,780 | $ 18,677 | $ 18,531
Net investment income | 886 | 936 | 878 | 878 | 874 | 870 | 862 | 837 | 3,578 | 3,442 | 3,220
Realized investment gains (losses) | 12 | (153) | (66) | 71 | (355) | 56 | 3 | (134) |  |  |
Other income (loss) | 34 | 17 | 18 | 17 | 16 | 15 | 18 | 16 | 84 | 69 | 67
Total revenues | 5,603 | 5,536 | 5,511 | 5,657 | 5,126 | 5,577 | 5,589 | 5,464 | 22,307 | 21,758 | 21,667
Total benefits and expenses | 4,545 | 4,500 | 4,402 | 4,415 | 4,404 | 4,431 | 4,458 | 4,482 | 17,862 | 17,775 | 17,649
Earnings before income taxes | 1,058 | 1,036 | 1,109 | 1,242 | 722 | 1,146 | 1,131 | 982 | 4,445 | 3,983 | 4,018
Total income tax expense | 276 | 259 | 292 | 314 | 197 | 301 | 299 | 265 | $ 1,141 | $ 1,063 | $ (586)
Net earnings | $ 782 | $ 777 | $ 817 | $ 928 | $ 525 | $ 845 | $ 832 | $ 717 |  |  |
Net earnings per basic share | $ 1.07 | $ 1.05 | $ 1.10 | $ 1.23 | $ 0.69 | $ 1.10 | $ 1.08 | $ 0.92 | $ 4.45 | $ 3.79 | $ 5.81
Net earnings per diluted share | $ 1.06 | $ 1.04 | $ 1.09 | $ 1.23 | $ 0.69 | $ 1.09 | $ 1.07 | $ 0.91 | $ 4.43 | $ 3.77 | $ 5.77
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net investment income |  |  |  |  |  |  |  |  | $ 77 | $ 69 | $ 30
Total revenues |  |  |  |  |  |  |  |  | 330 | 247 | 331
Total income tax expense |  |  |  |  |  |  |  |  | $ (22) | $ (12) | $ (23)

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