Investments (Payables For Collateral On Investments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Carrying Value Of Payables For Collateral On Investments [Abstract]
Collateral payable for derivative investments	$ 5,575	$ 2,976
Securities pledged under securities lending agreements	241	116
Investments pledged for Federal Home Loan Bank of Indianapolis ('FHLBI')	3,130	3,130
Total payables for collateral on investments	8,946	6,222
Fair Value Of Related Investments Or Collateral [Abstract]
Collateral payable for derivative investments	5,575	2,976
Securities pledged under securities lending agreements	235	112
Investments pledged for Federal Home Loan Bank of Indianapolis('FHLBI')	4,876	5,049
Total payables for collateral on investments	$ 10,686	$ 8,137
Percentage of the fair value of domestic securities obtained as collateral under securities lending agreements.	102.00%
Percentage of the fair value of foreign securities obtained as collateral under securities lending agreements.	105.00%
Maximum [Member]
Fair Value Of Related Investments Or Collateral [Abstract]
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for AFS Securities	115.00%
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for mortgage loan	175.00%
Minimum [Member]
Fair Value Of Related Investments Or Collateral [Abstract]
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for AFS Securities	105.00%
Percentage of the fair value of FHLBI securities obtained as collateral under securities pledged for FHLBI for mortgage loan	155.00%