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Investments (Fair Value And Gross Unrealized Losses In A Continuous Unrealized Loss Position) (Details) - Fixed Maturity AFS Securities [Member]
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
security
Jun. 30, 2021
USD ($)
security
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months $ 4,808 $ 10,310
Greater Than Twelve Months 1,068 1,394
Fair Value - Total 5,876 11,704
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 117 239
Greater Than Twelve Months 81 89
Gross Unrealized Losses - Total $ 198 $ 328
Total number of fixed maturity AFS securities in an unrealized loss position | security 802 1,368
Unrealized holding gains (losses) arising during the period $ 1  
Corporate Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 3,039 $ 6,476
Greater Than Twelve Months 607 1,055
Fair Value - Total 3,646 7,531
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 92 199
Greater Than Twelve Months 58 73
Gross Unrealized Losses - Total 150 272
U.S. Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 28 26
Fair Value - Total 28 26
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 2
Gross Unrealized Losses - Total 1 2
State And Municipal Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   389
Greater Than Twelve Months   1
Fair Value - Total   390
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   7
Gross Unrealized Losses - Total   7
Foreign Government Bonds [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 57 86
Greater Than Twelve Months   30
Fair Value - Total 57 116
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 3
Gross Unrealized Losses - Total 1 3
RMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 45 109
Greater Than Twelve Months 7 19
Fair Value - Total 52 128
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 1 1
Gross Unrealized Losses - Total 1 1
CMBS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months   306
Greater Than Twelve Months   5
Fair Value - Total   311
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months   7
Gross Unrealized Losses - Total   7
ABS [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 1,527 2,889
Greater Than Twelve Months 358 136
Fair Value - Total 1,885 3,025
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 9 19
Greater Than Twelve Months 6 3
Gross Unrealized Losses - Total 15 22
Hybrid And Redeemable Preferred Securities [Member]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value    
Less Than or Equal to Twelve Months 112 29
Greater Than Twelve Months 96 148
Fair Value - Total 208 177
Available-for-sale Securities, Continuous Unrealized Loss Position, Gross Unrealized Losses and OTTI    
Less Than or Equal to Twelve Months 13 1
Greater Than Twelve Months 17 13
Gross Unrealized Losses - Total $ 30 $ 14