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Consolidated Statements of Shareholders' Comprehensive Income - USD ($)
$ 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
Statement Of Comprehensive Income                      
Shareholders' net income $ 144 $ 772 $ 806 $ 915 $ 266 $ 560 $ 813 $ 598 $ 2,637 $ 2,237 $ 1,867
Shareholders' other comprehensive income (loss), net of tax:                      
Net unrealized appreciation (depreciation), securities and derivatives                 (365) (37) (60)
Net translation (losses) gains on foreign currencies                 (152) 304 (95)
Postretirement benefits liability adjustment                 127 33 23
Shareholders' other comprehensive income (loss), net of tax                 (390) 300 (132)
Shareholders' comprehensive income (loss)                 $ 2,247 $ 2,537 $ 1,735