Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables purchased from third parties	$ 840	$ 178
Accrued interest receivable	93		$ 95
Financing receivable, before allowance for credit losses	21,422		19,910
COVID-19 Pandemic financing receivables in nonaccrual status	31		30
Financing receivable in nonaccrual status	63		59
COVID-19 Pandemic Financial Asset Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit losses	$ 31		$ 30
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%
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivables in nonaccrual status, investment income	$ 1	$ 1
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit losses	4,226		$ 3,623
Financing receivable in nonaccrual status	63		59
Financing receivables in nonaccrual status with no allowance for credit losses	0		0
Residential | Performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, before allowance for credit losses	$ 4,163		$ 3,564