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Condensed Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net premiums earned | $ 7,465 | $ 7,908 | $ 7,664 | $ 7,027 | $ 7,218 | $ 7,807 | $ 7,237 | $ 6,772 | $ 30,064 | $ 29,034 | $ 28,749
Net Investment Income | 848 | 823 | 828 | 806 | 797 | 813 | 770 | 745 | 3,305 | 3,125 | 2,865
Net Realized Gain (Loss) | (687) | 19 | 18 | (2) |  |  |  |  | (652) |  |
Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments |  |  |  |  |  | (10) | 101 | (7) |  | 84 | (145)
Total revenues | 7,626 | 8,750 | 8,510 | 7,831 | 8,015 | 8,610 | 8,108 | 7,510 | 32,717 | 32,243 | 31,469
Losses and loss expenses | 4,610 | 4,868 | 4,487 | 4,102 | 4,272 | 6,247 | 4,146 | 3,789 | 18,067 | 18,454 | 16,052
Policy benefits | 162 | 127 | 150 | 151 | 176 | 169 | 163 | 168 | 590 | 676 | 588
Net income | $ 355 | $ 1,231 | $ 1,294 | $ 1,082 | $ 1,533 | $ (70) | $ 1,305 | $ 1,093 | $ 3,962 | $ 3,861 | $ 4,135
Basic earnings per share | $ 0.77 | $ 2.66 | $ 2.78 | $ 2.32 | $ 3.29 | $ (0.15) | $ 2.79 | $ 2.33 | $ 8.55 | $ 8.26 | $ 8.94
Diluted earnings per share | $ 0.76 | $ 2.64 | $ 2.76 | $ 2.30 | $ 3.27 | $ (0.15) | $ 2.77 | $ 2.31 | $ 8.49 | $ 8.19 | $ 8.87

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