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Investments, Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | $ 40,342 |  | $ 38,963 |  |  |
Gross unrealized gains | 4,847 |  | 5,800 |  |  |
Gross unrealized losses | 89 |  | 77 |  |  |
Allowance for credit loss | 31 | $ 45 | 40 | $ 47 | $ 51 | $ 0
Estimated fair value | 45,069 |  | 44,646 |  |  |
Shadow adjustments | 2,200 |  | 2,500 |  |  |
Fixed Maturities Available-for-Sale [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 40,333 |  | 38,926 |  |  |
Gross unrealized gains | 4,847 |  | 5,795 |  |  |
Gross unrealized losses | 89 |  | 77 |  |  |
Allowance for credit loss | 31 |  | 40 |  |  |
Estimated fair value | 45,060 |  | 44,604 |  |  |
Corporate and Other Bonds [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 21,608 |  | 20,792 |  |  |
Gross unrealized gains | 2,967 |  | 3,578 |  |  |
Gross unrealized losses | 42 |  | 22 |  |  |
Allowance for credit loss | 10 | 24 | 23 | 34 | 39 | 0
Estimated fair value | 24,523 |  | 24,325 |  |  |
States, Municipalities and Political Subdivisions [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 10,384 |  | 9,729 |  |  |
Gross unrealized gains | 1,610 |  | 1,863 |  |  |
Gross unrealized losses | 15 |  |  |  |  |
Estimated fair value | 11,979 |  | 11,592 |  |  |
Asset-Backed [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 7,669 |  | 7,554 |  |  |
Gross unrealized gains | 250 |  | 320 |  |  |
Gross unrealized losses | 26 |  | 52 |  |  |
Allowance for credit loss | 21 | $ 21 | 17 | $ 13 | $ 12 | $ 0
Estimated fair value | 7,872 |  | 7,805 |  |  |
Residential Mortgage-Backed [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 3,176 |  | 3,442 |  |  |
Gross unrealized gains | 89 |  | 146 |  |  |
Gross unrealized losses | 6 |  | 1 |  |  |
Estimated fair value | 3,259 |  | 3,587 |  |  |
Commercial Mortgage-Backed [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 2,064 |  | 1,933 |  |  |
Gross unrealized gains | 85 |  | 93 |  |  |
Gross unrealized losses | 16 |  | 42 |  |  |
Allowance for credit loss | 17 |  | 17 |  |  |
Estimated fair value | 2,116 |  | 1,967 |  |  |
Other Asset-Backed [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 2,429 |  | 2,179 |  |  |
Gross unrealized gains | 76 |  | 81 |  |  |
Gross unrealized losses | 4 |  | 9 |  |  |
Allowance for credit loss | 4 |  |  |  |  |
Estimated fair value | 2,497 |  | 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 | 139 |  | 339 |  |  |
Gross unrealized gains | 1 |  | 2 |  |  |
Gross unrealized losses | 4 |  | 3 |  |  |
Estimated fair value | 136 |  | 338 |  |  |
Foreign Government [Member] |  |  |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |  |  |
Cost or amortized cost | 521 |  | 512 |  |  |
Gross unrealized gains | 19 |  | 32 |  |  |
Gross unrealized losses | 2 |  |  |  |  |
Estimated fair value | 538 |  | 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 | 9 |  | 37 |  |  |
Gross unrealized gains |  |  | 5 |  |  |
Estimated fair value | $ 9 |  | $ 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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