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Quarterly Results (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Revenues $ 5,328 $ 5,171 $ 5,068 $ 4,956 $ 5,361 $ 5,347 $ 5,092 $ 4,940 $ 20,523 $ 20,740 $ 18,955
Benefits, losses and expenses 4,676 4,639 4,476 4,612 4,685 4,694 4,636 4,165 18,403 18,180 17,202
Income from continuing operations, net of tax                 1,737 2,085 1,485
Net income (loss) 537 459 468 273 548 535 372 630 1,737 2,085 1,807
Preferred stock dividends 5 6 5 5 5 11 0 5 21 21 6
Net income (loss) available to common stockholders $ 532 $ 453 $ 463 $ 268 $ 543 $ 524 $ 372 $ 625 $ 1,716 $ 2,064 $ 1,801
Basic                      
Net income available to common stockholders $ 1.48 $ 1.26 $ 1.29 $ 0.75 $ 1.51 $ 1.45 $ 1.03 $ 1.74 $ 4.79 $ 5.72 $ 5.03
Diluted                      
Net income available to common stockholders $ 1.47 $ 1.26 $ 1.29 $ 0.74 $ 1.49 $ 1.43 $ 1.02 $ 1.71 $ 4.76 $ 5.66 $ 4.95