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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details)
$ in Millions
Jun. 30, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Schedule of Available-for-sale Securities [Line Items]    
Total number of AFS securities in an unrealized loss position | security 872 3,360
Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 1,870 $ 33,630
Greater Than Twelve Months 6,876 8,386
Fair Value - Total 8,746 42,016
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 45 1,521
Greater Than Twelve Months 345 818
Gross Unrealized Losses - Total 390 2,339
Corporate Bonds [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 1,156 30,947
Greater Than Twelve Months 5,966 7,023
Fair Value - Total 7,122 37,970
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 41 1,464
Greater Than Twelve Months 294 704
Gross Unrealized Losses - Total 335 2,168
ABS [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 35 113
Greater Than Twelve Months 83 136
Fair Value - Total 118 249
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   2
Greater Than Twelve Months 9 13
Gross Unrealized Losses - Total 9 15
U.S. Government Bonds [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   70
Greater Than Twelve Months   23
Fair Value - Total   93
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   1
Greater Than Twelve Months   1
Gross Unrealized Losses - Total   2
RMBS [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 11 436
Greater Than Twelve Months 437 796
Fair Value - Total 448 1,232
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   9
Greater Than Twelve Months 10 55
Gross Unrealized Losses - Total 10 64
CMBS [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   470
Greater Than Twelve Months   82
Fair Value - Total   552
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   11
Greater Than Twelve Months   5
Gross Unrealized Losses - Total   16
CLOs [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 481 1,124
Greater Than Twelve Months 204 103
Fair Value - Total 685 1,227
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 2 21
Greater Than Twelve Months 5 3
Gross Unrealized Losses - Total 7 24
State And Municipal Bonds [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 115 376
Greater Than Twelve Months 78 92
Fair Value - Total 193 468
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 7
Greater Than Twelve Months 3 10
Gross Unrealized Losses - Total 4 17
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 72 94
Greater Than Twelve Months 108 131
Fair Value - Total 180 225
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 6
Greater Than Twelve Months 24 27
Gross Unrealized Losses - Total $ 25 $ 33