Schedule V. Valuation and Qualifying Accounts (Schedule of valuation and qualifying accounts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Mortgage loan receivables
Movement in valuation allowances and reserves [Roll Forward]
Balance Beginning of Period	$ 7
Charged to Costs and Expenses	0
Charged to Other Accounts	19
Deductions	0
Balance at End of Period	26	$ 7
Insurance and reinsurance receivables
Movement in valuation allowances and reserves [Roll Forward]
Balance Beginning of Period	57	71	$ 73
Charged to Costs and Expenses	4	(6)	4
Charged to Other Accounts	0	0	0
Deductions	(7)	(8)	(6)
Balance at End of Period	54	57	$ 71
Fixed maturity securities
Movement in valuation allowances and reserves [Roll Forward]
Balance Beginning of Period	6
Charged to Costs and Expenses	0
Charged to Other Accounts	92
Deductions	(58)
Balance at End of Period	$ 40	$ 6