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Investments, Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 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 | $ 39,293 | $ 38,963 |  |
Gross unrealized gains | 4,516 | 5,800 |  |
Gross unrealized losses | 182 | 77 |  |
Allowance for credit loss | 43 | 40 | $ 49 | $ 0
Estimated fair value | 43,584 | 44,646 |  |
Shadow adjustments | 2,100 | 2,500 |  |
Fixed Maturities Available-for-Sale [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost | 39,257 | 38,926 |  |
Gross unrealized gains | 4,513 | 5,795 |  |
Gross unrealized losses | 182 | 77 |  |
Allowance for credit loss | 43 | 40 |  |
Estimated fair value | 43,545 | 44,604 |  |
Corporate and Other Bonds [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost | 21,110 | 20,792 |  |
Gross unrealized gains | 2,644 | 3,578 |  |
Gross unrealized losses | 71 | 22 |  |
Allowance for credit loss | 27 | 23 | 49 | 0
Estimated fair value | 23,656 | 24,325 |  |
States, Municipalities and Political Subdivisions [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost | 10,041 | 9,729 |  |
Gross unrealized gains | 1,590 | 1,863 |  |
Gross unrealized losses | 31 |  |  |
Estimated fair value | 11,600 | 11,592 |  |
Asset-Backed [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost | 7,448 | 7,554 |  |
Gross unrealized gains | 255 | 320 |  |
Gross unrealized losses | 71 | 52 |  |
Allowance for credit loss | 16 | 17 | $ 0 | $ 0
Estimated fair value | 7,616 | 7,805 |  |
Residential Mortgage-Backed [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost | 3,215 | 3,442 |  |
Gross unrealized gains | 108 | 146 |  |
Gross unrealized losses | 40 | 1 |  |
Estimated fair value | 3,283 | 3,587 |  |
Commercial Mortgage-Backed [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost | 1,952 | 1,933 |  |
Gross unrealized gains | 76 | 93 |  |
Gross unrealized losses | 24 | 42 |  |
Allowance for credit loss | 16 | 17 |  |
Estimated fair value | 1,988 | 1,967 |  |
Other Asset-Backed [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost | 2,281 | 2,179 |  |
Gross unrealized gains | 71 | 81 |  |
Gross unrealized losses | 7 | 9 |  |
Estimated fair value | 2,345 | 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 | 138 | 339 |  |
Gross unrealized gains | 1 | 2 |  |
Gross unrealized losses | 7 | 3 |  |
Estimated fair value | 132 | 338 |  |
Foreign Government [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost | 508 | 512 |  |
Gross unrealized gains | 23 | 32 |  |
Gross unrealized losses | 2 |  |  |
Estimated fair value | 529 | 544 |  |
Redeemable Preferred Stock [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost | 12 |  |  |
Estimated fair value | 12 |  |  |
Fixed Maturities Trading [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost | 36 | 37 |  |
Gross unrealized gains | 3 | 5 |  |
Estimated fair value | $ 39 | $ 42 |  |

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- Definition To the extent that unrealized gains on fixed income securities supporting long term care products and structured settlements not funded by annuities would result in a premium deficiency if those gains were realized, a related increase in Insurance reserves is recorded, net of tax and noncontrolling interests, as a reduction of net unrealized gains through Other comprehensive income (loss) (Shadow Adjustments). + References No definition available. + Details
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