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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details)
$ in Millions
Dec. 31, 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 882 3,360
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 5,482 $ 33,630
Greater Than Twelve Months 1,820 8,386
Fair Value - Total 7,302 42,016
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 70 1,521
Greater Than Twelve Months 159 818
Gross Unrealized Losses - Total 229 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 2,827 30,947
Greater Than Twelve Months 1,381 7,023
Fair Value - Total 4,208 37,970
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 44 1,464
Greater Than Twelve Months 131 704
Gross Unrealized Losses - Total 175 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 1,791 1,237
Greater Than Twelve Months 300 239
Fair Value - Total 2,091 1,476
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 8 23
Greater Than Twelve Months 9 16
Gross Unrealized Losses - Total 17 39
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 471 436
Greater Than Twelve Months 15 796
Fair Value - Total 486 1,232
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 9 9
Greater Than Twelve Months   55
Gross Unrealized Losses - Total 9 64
CMBS [Member] | Fixed Maturity Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 48 470
Greater Than Twelve Months 4 82
Fair Value - Total 52 552
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 11
Greater Than Twelve Months   5
Gross Unrealized Losses - Total 1 16
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 316 376
Greater Than Twelve Months 18 92
Fair Value - Total 334 468
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 7 7
Greater Than Twelve Months   10
Gross Unrealized Losses - Total 7 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 29 94
Greater Than Twelve Months 102 131
Fair Value - Total 131 225
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 19 27
Gross Unrealized Losses - Total $ 20 $ 33