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Investments, Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | $ 39,826 |  | $ 38,963 |  |  |
Gross unrealized gains | 5,199 |  | 5,800 |  |  |
Gross unrealized losses | 70 |  | 77 |  |  |
Allowance for credit loss | 45 | $ 43 | 40 | $ 51 | $ 49 | $ 0
Estimated fair value | 44,910 |  | 44,646 |  |  |
Shadow adjustments | 2,400 |  | 2,500 |  |  |
Fixed Maturities Available-for-Sale [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 39,816 |  | 38,926 |  |  |
Gross unrealized gains | 5,199 |  | 5,795 |  |  |
Gross unrealized losses | 70 |  | 77 |  |  |
Allowance for credit loss | 45 |  | 40 |  |  |
Estimated fair value | 44,900 |  | 44,604 |  |  |
Corporate and Other Bonds [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 21,291 |  | 20,792 |  |  |
Gross unrealized gains | 3,153 |  | 3,578 |  |  |
Gross unrealized losses | 35 |  | 22 |  |  |
Allowance for credit loss | 24 | 27 | 23 | 39 | 49 | 0
Estimated fair value | 24,385 |  | 24,325 |  |  |
States, Municipalities and Political Subdivisions [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 10,125 |  | 9,729 |  |  |
Gross unrealized gains | 1,743 |  | 1,863 |  |  |
Gross unrealized losses | 2 |  |  |  |  |
Estimated fair value | 11,866 |  | 11,592 |  |  |
Asset-Backed [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 7,743 |  | 7,554 |  |  |
Gross unrealized gains | 281 |  | 320 |  |  |
Gross unrealized losses | 27 |  | 52 |  |  |
Allowance for credit loss | 21 | $ 16 | 17 | $ 12 | $ 0 | $ 0
Estimated fair value | 7,976 |  | 7,805 |  |  |
Residential Mortgage-Backed [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 3,337 |  | 3,442 |  |  |
Gross unrealized gains | 99 |  | 146 |  |  |
Gross unrealized losses | 10 |  | 1 |  |  |
Estimated fair value | 3,426 |  | 3,587 |  |  |
Commercial Mortgage-Backed [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 2,068 |  | 1,933 |  |  |
Gross unrealized gains | 98 |  | 93 |  |  |
Gross unrealized losses | 14 |  | 42 |  |  |
Allowance for credit loss | 17 |  | 17 |  |  |
Estimated fair value | 2,135 |  | 1,967 |  |  |
Other Asset-Backed [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 2,338 |  | 2,179 |  |  |
Gross unrealized gains | 84 |  | 81 |  |  |
Gross unrealized losses | 3 |  | 9 |  |  |
Allowance for credit loss | 4 |  |  |  |  |
Estimated fair value | 2,415 |  | 2,251 |  |  |
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 142 |  | 339 |  |  |
Gross unrealized gains |  |  | 2 |  |  |
Gross unrealized losses | 5 |  | 3 |  |  |
Estimated fair value | 137 |  | 338 |  |  |
Foreign Government [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 515 |  | 512 |  |  |
Gross unrealized gains | 22 |  | 32 |  |  |
Gross unrealized losses | 1 |  |  |  |  |
Estimated fair value | 536 |  | 544 |  |  |
Fixed Maturities Trading [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 10 |  | 37 |  |  |
Gross unrealized gains |  |  | 5 |  |  |
Estimated fair value | $ 10 |  | $ 42 |  |  |

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