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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 87,240 $ 84,747
Gross unrealized gains 8,233 5,851
Gross unrealized losses 450 1,139
OTTI [1] (63) (29)
Fair value 95,086 89,488
Equity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 247 260
Gross unrealized gains 16 19
Gross unrealized losses 17 4
Fair value 246 275
Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 86,993 84,487
Gross unrealized gains 8,217 5,832
Gross unrealized losses 433 1,135
OTTI [1] (63) (29)
Fair value 94,840 89,213
Corporate Bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 75,701 73,275
Gross unrealized gains 6,862 4,754
Gross unrealized losses 354 970
OTTI [1] (7) (5)
Fair value 82,216 77,064
ABS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 903 1,047
Gross unrealized gains 51 39
Gross unrealized losses 7 14
OTTI [1] (27) (13)
Fair value 974 1,085
U.S. government bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 527 384
Gross unrealized gains 41 37
Gross unrealized losses 1 2
Fair value 567 419
Foreign Government Bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 395 449
Gross unrealized gains 56 58
Gross unrealized losses   1
Fair value 451 506
RMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 3,327 3,534
Gross unrealized gains 155 147
Gross unrealized losses 39 73
OTTI [1] (22) (6)
Fair value 3,465 3,614
CMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 590 345
Gross unrealized gains 10 8
Gross unrealized losses 2 4
OTTI [1] (2) (1)
Fair value 600 350
CLOs [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 803 742
Gross unrealized gains 2 1
Gross unrealized losses 2 3
OTTI [1] (5) (4)
Fair value 808 744
State and municipal bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 4,172 3,929
Gross unrealized gains 953 718
Gross unrealized losses 6 20
Fair value 5,119 4,627
Hybrid and redeemable preferred securities [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 575 582
Gross unrealized gains 87 70
Gross unrealized losses 22 48
Fair value $ 640 604
VIEs' fixed maturity securities [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost   200
Fair value   $ 200
[1] Includes unrealized (gains) and losses on impaired securities related to changes in the fair value of such securities subsequent to the impairment measurement date.