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Variable Annuity and Insurance Guarantees (Liability Rollforward) (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
GMDB and GGU [Member]    
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees    
Beginning Balance $ 16 $ 19
Incurred claims 5 1
Paid claims (4) (3)
Ending Balance 17 17
GMIB [Member]    
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees    
Beginning Balance 7 8
Incurred claims 1 (1)
Paid claims (1)  
Ending Balance 7 7
GMWB [Member]    
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees    
Beginning Balance 1,462 875
Incurred claims [1] 2,387 422
Ending Balance 3,849 1,297
GMAB [Member]    
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees    
Beginning Balance (39) (19)
Incurred claims [1] 69 (16)
Ending Balance 30 (35)
UL [Member]    
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees    
Beginning Balance 758 659
Incurred claims 65 64
Paid claims (24) (25)
Ending Balance $ 799 $ 698
[1] The incurred claims for GMWB and GMAB include the change in the fair value of the liabilities (contra liabilities) less paid claims.