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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized Cost | $ 98,817 |  | $ 94,295
ACL | (22) | $ (20) | 0
Fair Value | 113,519 |  | 105,200
Corporate Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
ACL | (20) | $ (20) |
RMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
ACL | (1) |  |
ABS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
ACL | (1) |  |
Fixed Maturity AFS Securities [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized Cost | 98,817 |  | 94,295
Gross unrealized gains | 15,323 |  | 11,086
Gross unrealized losses | 599 |  | 240
ACL | 22 |  |
OTTI |  |  | (59)
Fair Value | 113,519 |  | 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 | 82,788 |  | 79,417
Gross unrealized gains | 13,102 |  | 9,479
Gross unrealized losses | 480 |  | 184
ACL | 20 |  |
OTTI |  |  | (4)
Fair Value | 95,390 |  | 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 | 404 |  | 384
Gross unrealized gains | 100 |  | 51
Fair Value | 504 |  | 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 | 4,958 |  | 4,778
Gross unrealized gains | 1,437 |  | 1,113
Gross unrealized losses | 2 |  | 7
Fair Value | 6,393 |  | 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 | 358 |  | 329
Gross unrealized gains | 81 |  | 64
Gross unrealized losses | 3 |  |
Fair Value | 436 |  | 393
Fixed Maturity AFS Securities [Member] | RMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized Cost | 2,951 |  | 3,042
Gross unrealized gains | 324 |  | 190
Gross unrealized losses | 2 |  | 10
ACL | 1 |  |
OTTI |  |  | (19)
Fair Value | 3,272 |  | 3,241
Fixed Maturity AFS Securities [Member] | CMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized Cost | 1,133 |  | 1,038
Gross unrealized gains | 94 |  | 45
Gross unrealized losses | 1 |  | 1
OTTI |  |  | (1)
Fair Value | 1,226 |  | 1,083
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized Cost | 5,666 |  | 4,810
Gross unrealized gains | 111 |  | 62
Gross unrealized losses | 60 |  | 18
ACL | 1 |  |
OTTI |  |  | (35)
Fair Value | 5,716 |  | 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 | 559 |  | 497
Gross unrealized gains | 74 |  | 82
Gross unrealized losses | 51 |  | 20
Fair Value | $ 582 |  | $ 559

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