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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized Cost | $ 101,885 |  | $ 94,295
ACL | (12) | $ (22) | 0
Fair Value | 118,252 |  | 105,200
Corporate Bonds [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
ACL | (11) | (20) |
RMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
ACL | (1) | (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 | 101,885 |  | 94,295
Gross unrealized gains | 16,817 |  | 11,086
Gross unrealized losses | 438 |  | 240
ACL | 12 |  |
OTTI |  |  | (59)
Fair Value | 118,252 |  | 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 | 84,658 |  | 79,417
Gross unrealized gains | 14,437 |  | 9,479
Gross unrealized losses | 367 |  | 184
ACL | 11 |  |
OTTI |  |  | (4)
Fair Value | 98,717 |  | 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 | 397 |  | 384
Gross unrealized gains | 99 |  | 51
Fair Value | 496 |  | 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 | 5,257 |  | 4,778
Gross unrealized gains | 1,520 |  | 1,113
Gross unrealized losses | 3 |  | 7
Fair Value | 6,774 |  | 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 | 357 |  | 329
Gross unrealized gains | 82 |  | 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 | 2,870 |  | 3,042
Gross unrealized gains | 334 |  | 190
Gross unrealized losses |  |  | 10
ACL | 1 |  |
OTTI |  |  | (19)
Fair Value | 3,203 |  | 3,241
Fixed Maturity AFS Securities [Member] | CMBS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized Cost | 1,317 |  | 1,038
Gross unrealized gains | 114 |  | 45
Gross unrealized losses | 1 |  | 1
OTTI |  |  | (1)
Fair Value | 1,430 |  | 1,083
Fixed Maturity AFS Securities [Member] | ABS [Member] |  |  |
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities |  |  |
Amortized Cost | 6,472 |  | 4,810
Gross unrealized gains | 140 |  | 62
Gross unrealized losses | 22 |  | 18
OTTI |  |  | (35)
Fair Value | 6,590 |  | 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 | 557 |  | 497
Gross unrealized gains | 91 |  | 82
Gross unrealized losses | 42 |  | 20
Fair Value | $ 606 |  | $ 559

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