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Investments, Amortized Cost and Fair Values of Fixed Maturity Securities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
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Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | $ 38,059 |  | $ 38,157
Gross unrealized gains |  | 3,231 |  | 4,128
Gross unrealized losses |  | 1,117 |  | 45
Allowance for credit loss |  | 49 | [1] | 0
Estimated fair value |  | 40,124 |  | 42,240
Unrealized OTTI losses (gains) | [1] |  |  | (19)
Shadow adjustments |  | 1,500 |  | 2,000
Fixed Maturities Available-for-Sale [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | 38,019 |  | 38,106
Gross unrealized gains |  | 3,230 |  | 4,126
Gross unrealized losses |  | 1,117 |  | 45
Allowance for credit loss | [1] | 49 |  |
Estimated fair value |  | 40,083 |  | 42,187
Unrealized OTTI losses (gains) | [1] |  |  | (19)
Corporate and Other Bonds [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | 20,181 |  | 19,789
Gross unrealized gains |  | 1,419 |  | 2,292
Gross unrealized losses |  | 817 |  | 32
Allowance for credit loss |  | 49 | [1] | 0
Estimated fair value |  | 20,734 |  | 22,049
States, Municipalities and Political Subdivisions [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | 8,957 |  | 9,093
Gross unrealized gains |  | 1,536 |  | 1,559
Gross unrealized losses |  | 2 |  |
Estimated fair value |  | 10,491 |  | 10,652
Asset-Backed [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | 8,273 |  | 8,577
Gross unrealized gains |  | 252 |  | 260
Gross unrealized losses |  | 294 |  | 10
Allowance for credit loss | [1] | 0 |  |
Estimated fair value |  | 8,231 |  | 8,827
Unrealized OTTI losses (gains) | [1] |  |  | (19)
Residential Mortgage-Backed [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | 4,198 |  | 4,387
Gross unrealized gains |  | 207 |  | 133
Gross unrealized losses |  | 8 |  | 1
Estimated fair value |  | 4,397 |  | 4,519
Unrealized OTTI losses (gains) | [1] |  |  | (17)
Commercial Mortgage-Backed [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | 2,207 |  | 2,265
Gross unrealized gains |  | 36 |  | 86
Gross unrealized losses |  | 153 |  | 5
Estimated fair value |  | 2,090 |  | 2,346
Unrealized OTTI losses (gains) | [1] |  |  | 1
Other Asset-Backed [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | 1,868 |  | 1,925
Gross unrealized gains |  | 9 |  | 41
Gross unrealized losses |  | 133 |  | 4
Estimated fair value |  | 1,744 |  | 1,962
Unrealized OTTI losses (gains) | [1] |  |  | (3)
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | 147 |  | 146
Gross unrealized gains |  | 8 |  | 1
Gross unrealized losses |  |  |  | 2
Estimated fair value |  | 155 |  | 145
Foreign Government [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | 452 |  | 491
Gross unrealized gains |  | 15 |  | 14
Gross unrealized losses |  | 4 |  | 1
Estimated fair value |  | 463 |  | 504
Redeemable Preferred Stock [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | 9 |  | 10
Estimated fair value |  | 9 |  | 10
Fixed Maturities Trading [Member] |  |  |  |
Amortized Cost and Fair Values of Fixed Maturity Securities [Abstract] |  |  |  |
Cost or amortized cost |  | 40 |  | 51
Gross unrealized gains |  | 1 |  | 2
Estimated fair value |  | $ 41 |  | $ 53
[1] | On January 1, 2020, the Company adopted ASU 2016-13; see Note 1. The Unrealized OTTI Losses (Gains) column that tracked subsequent valuation changes on securities for which a credit loss had previously been recorded has been replaced with the Allowance for Credit Losses column. Prior period amounts were not adjusted for the adoption of this standard.

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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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