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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost $ 86,456 $ 84,747
Gross unrealized gains 7,384 5,851
Gross unrealized losses 601 1,139
Gross unrealized OTTI [1] (50) (29)
Fair value 93,289 89,488
Equity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 262 260
Gross unrealized gains 19 19
Gross unrealized losses 6 4
Fair value 275 275
Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 86,194 84,487
Gross unrealized gains 7,365 5,832
Gross unrealized losses 595 1,135
Gross unrealized OTTI [1] (50) (29)
Fair value 93,014 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 74,934 73,275
Gross unrealized gains 6,108 4,754
Gross unrealized losses 500 970
Gross unrealized OTTI [1] (6) (5)
Fair value 80,548 77,064
ABS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 996 1,047
Gross unrealized gains 46 39
Gross unrealized losses 12 14
Gross unrealized OTTI [1] (20) (13)
Fair value 1,050 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 536 384
Gross unrealized gains 44 37
Gross unrealized losses 2 2
Fair value 578 419
Foreign government bonds [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 397 449
Gross unrealized gains 58 58
Gross unrealized losses   1
Fair value 455 506
RMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 3,412 3,534
Gross unrealized gains 160 147
Gross unrealized losses 38 73
Gross unrealized OTTI [1] (18) (6)
Fair value 3,552 3,614
CMBS [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 466 345
Gross unrealized gains 10 8
Gross unrealized losses 2 4
Gross unrealized OTTI [1] (2) (1)
Fair value 476 350
CLOs [Member] | Fixed maturity AFS securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 697 742
Gross unrealized gains 4 1
Gross unrealized losses 2 3
Gross unrealized OTTI [1] (4) (4)
Fair value 703 744
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 850 718
Gross unrealized losses 12 20
Fair value 5,010 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 584 582
Gross unrealized gains 85 70
Gross unrealized losses 27 48
Fair value $ 642 604
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.