Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables purchased from third parties	$ 2,100	$ 815
Accrued interest receivable	95	88
Financing receivable, before allowance for credit losses	19,910	15,816
COVID-19 Pandemic financing receivables in nonaccrual status	30	38
Financing receivables in nonaccrual status, investment income	1	2
COVID-19 Pandemic Financial Asset Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit losses	$ 30	$ 38
Minimum | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit losses by performance status as a percentage of financing receivables, before allowance for credit losses	99.00%	99.00%
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit losses	$ 3,623	$ 2,650
Financing receivables in nonaccrual status with no allowance for credit losses	0	7
Residential | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit losses	$ 3,564	$ 2,584