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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - Fixed Maturity AFS Securities [Member] - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | $ 92,192 | $ 92,429
Gross unrealized gains |  | 11,676 | 3,981
Gross unrealized losses |  | 258 | 2,430
OTTI | [1] | (49) | (44)
Fair value |  | 103,659 | 94,024
Corporate Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 78,301 | 79,623
Gross unrealized gains |  | 9,833 | 2,980
Gross unrealized losses |  | 220 | 2,263
OTTI | [1] | 3 | (8)
Fair value |  | 87,911 | 80,348
ABS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 4,074 | 2,662
Gross unrealized gains |  | 76 | 45
Gross unrealized losses |  | 11 | 30
OTTI | [1] | (33) | (19)
Fair value |  | 4,172 | 2,696
U.S. Government Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 375 | 390
Gross unrealized gains |  | 63 | 29
Gross unrealized losses |  |  | 2
Fair value |  | 438 | 417
Foreign Government Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 378 | 406
Gross unrealized gains |  | 66 | 42
Fair value |  | 444 | 448
RMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 3,041 | 3,308
Gross unrealized gains |  | 229 | 118
Gross unrealized losses |  | 1 | 67
OTTI | [1] | (18) | (14)
Fair value |  | 3,287 | 3,373
CMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 975 | 811
Gross unrealized gains |  | 56 | 6
Gross unrealized losses |  |  | 16
OTTI | [1] | (1) | (3)
Fair value |  | 1,032 | 804
State And Municipal Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 4,528 | 4,647
Gross unrealized gains |  | 1,274 | 716
Gross unrealized losses |  | 2 | 18
Fair value |  | 5,800 | 5,345
Hybrid And Redeemable Preferred Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized cost |  | 520 | 582
Gross unrealized gains |  | 79 | 45
Gross unrealized losses |  | 24 | 34
Fair value |  | $ 575 | $ 593
[1] | Includes unrealized (gains) and losses on credit-impaired securities related to changes in the fair value of such securities subsequent to the impairment measurement date.

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