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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details)
$ in Millions
Dec. 31, 2018
USD ($)
security
Dec. 31, 2017
USD ($)
security
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 33,630 $ 5,684
Greater Than Twelve Months 8,386 5,820
Fair Value - Total 42,016 11,504
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1,521 87
Greater Than Twelve Months 818 358
Gross Unrealized Losses - Total $ 2,339 $ 445
Total number of AFS securities in an unrealized loss position | security 3,360 1,095
Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   $ 5,662
Greater Than Twelve Months   5,812
Fair Value - Total   11,474
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   73
Greater Than Twelve Months   355
Gross Unrealized Losses - Total   428
Equity AFS Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   22
Greater Than Twelve Months   8
Fair Value - Total   30
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   14
Greater Than Twelve Months   3
Gross Unrealized Losses - Total   17
Corporate Bonds [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 30,947 4,726
Greater Than Twelve Months 7,023 4,706
Fair Value - Total 37,970 9,432
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1,464 67
Greater Than Twelve Months 704 276
Gross Unrealized Losses - Total 2,168 343
ABS [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 113 56
Greater Than Twelve Months 136 143
Fair Value - Total 249 199
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 13 15
Gross Unrealized Losses - Total 15 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 70 156
Greater Than Twelve Months 23 19
Fair Value - Total 93 175
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 1
Gross Unrealized Losses - Total 2 1
RMBS [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 436 277
Greater Than Twelve Months 796 599
Fair Value - Total 1,232 876
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 9 4
Greater Than Twelve Months 55 33
Gross Unrealized Losses - Total 64 37
CMBS [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 470 113
Greater Than Twelve Months 82 60
Fair Value - Total 552 173
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 3
Gross Unrealized Losses - Total 16 3
CLOs [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 1,124 281
Greater Than Twelve Months 103 72
Fair Value - Total 1,227 353
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 21 2
Greater Than Twelve Months 3  
Gross Unrealized Losses - Total 24 2
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 376 33
Greater Than Twelve Months 92 89
Fair Value - Total 468 122
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 7  
Greater Than Twelve Months 10 5
Gross Unrealized Losses - Total 17 5
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 94 20
Greater Than Twelve Months 131 124
Fair Value - Total 225 144
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 6  
Greater Than Twelve Months 27 22
Gross Unrealized Losses - Total $ 33 $ 22