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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |
Amortized Cost | $ 96,217 | $ 94,295
ACL | (20) | 0
Fair Value | 102,606 | 105,200
Corporate Bonds [Member] |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |
ACL | (20) |
Fixed Maturity AFS Securities [Member] |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |
Amortized Cost | 96,217 | 94,295
Gross unrealized gains | 8,745 | 11,086
Gross unrealized losses | 2,336 | 240
ACL | 20 |
OTTI |  | (59)
Fair Value | 102,606 | 105,200
Fixed Maturity AFS Securities [Member] | Corporate Bonds [Member] |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |
Amortized Cost | 80,785 | 79,417
Gross unrealized gains | 7,031 | 9,479
Gross unrealized losses | 1,999 | 184
ACL | 20 |
OTTI |  | (4)
Fair Value | 85,797 | 88,716
Fixed Maturity AFS Securities [Member] | U.S. Government Bonds [Member] |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |
Amortized Cost | 380 | 384
Gross unrealized gains | 102 | 51
Fair Value | 482 | 435
Fixed Maturity AFS Securities [Member] | State And Municipal Bonds [Member] |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |
Amortized Cost | 4,797 | 4,778
Gross unrealized gains | 1,123 | 1,113
Gross unrealized losses | 14 | 7
Fair Value | 5,906 | 5,884
Fixed Maturity AFS Securities [Member] | Foreign Government Bonds [Member] |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |
Amortized Cost | 329 | 329
Gross unrealized gains | 63 | 64
Gross unrealized losses | 3 |
Fair Value | 389 | 393
Fixed Maturity AFS Securities [Member] | RMBS [Member] |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |
Amortized Cost | 3,014 | 3,042
Gross unrealized gains | 277 | 190
Gross unrealized losses | 20 | 10
OTTI |  | (19)
Fair Value | 3,271 | 3,241
Fixed Maturity AFS Securities [Member] | CMBS [Member] |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |
Amortized Cost | 1,089 | 1,038
Gross unrealized gains | 39 | 45
Gross unrealized losses | 9 | 1
OTTI |  | (1)
Fair Value | 1,119 | 1,083
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |
Amortized Cost | 5,259 | 4,810
Gross unrealized gains | 59 | 62
Gross unrealized losses | 232 | 18
OTTI |  | (35)
Fair Value | 5,086 | 4,889
Fixed Maturity AFS Securities [Member] | Hybrid And Redeemable Preferred Securities [Member] |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |
Amortized Cost | 564 | 497
Gross unrealized gains | 51 | 82
Gross unrealized losses | 59 | 20
Fair Value | $ 556 | $ 559

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