Allowance for Expected Credit Losses (Details) - Changes in the Allowance for Expected Credit Losses on Contractholder Receivables (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Credit Loss [Abstract]
Contractholder receivables (net of the allowance for expected credit losses), balance, beginning of period	$ 3,890	$ 4,242
Contractholder receivables (net of the allowance for expected credit losses), balance, end of period	3,901	4,271
Contractholder receivables, allowance for expected credit losses [Roll Forward]
Contractholder receivables, allowance for expected credit losses, beginning balance	21	19
Current period change for expected credit losses	(2)	0
Write-offs of uncollectible contractholder receivables	0	0
Contractholder receivables, allowance for expected credit losses, ending balance	$ 19	$ 19