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Investments (Reconciliation Of Available-For-Sale Securities From Cost Basis To Fair Value) (Details) - Fixed Maturity 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 $ 90,928 $ 91,219
Gross unrealized gains 11,195 3,851
Gross unrealized losses 247 2,326
OTTI [1] (49) (43)
Fair value 101,925 92,787
Corporate Bonds [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 77,470 78,837
Gross unrealized gains 9,407 2,871
Gross unrealized losses 209 2,167
OTTI [1] 2 (8)
Fair value 86,666 79,549
ABS [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 4,067 2,644
Gross unrealized gains 76 45
Gross unrealized losses 11 30
OTTI [1] (33) (19)
Fair value 4,165 2,678
U.S. Government Bonds [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 347 361
Gross unrealized gains 58 27
Gross unrealized losses   2
Fair value 405 386
Foreign Government Bonds [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 374 402
Gross unrealized gains 66 42
Fair value 440 444
RMBS [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 2,823 3,099
Gross unrealized gains 214 113
Gross unrealized losses 1 61
OTTI [1] (17) (13)
Fair value 3,053 3,164
CMBS [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 975 810
Gross unrealized gains 56 6
Gross unrealized losses   16
OTTI [1] (1) (3)
Fair value 1,032 803
State And Municipal Bonds [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 4,365 4,498
Gross unrealized gains 1,242 703
Gross unrealized losses 2 17
Fair value 5,605 5,184
Hybrid And Redeemable Preferred Securities [Member]    
Amortized cost, gross unrealized gains, losses, OTTI and fair value of AFS securities    
Amortized cost 507 568
Gross unrealized gains 76 44
Gross unrealized losses 24 33
Fair value $ 559 $ 579
[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.