Schedule V - Valuation Allowances and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Allowance for reinsurance recoverables
Valuation allowances and qualifying accounts
Balance as of beginning of period	$ 65	$ 70	$ 84
Additions, Charged to costs and expenses	(2)	(5)	(10)
Additions, Other additions	0	0	0
Deductions	0	0	4
Balance as of end of period	63	65	70
Allowance for premium installment receivable
Valuation allowances and qualifying accounts
Balance as of beginning of period	77	77	84
Additions, Charged to costs and expenses	137	118	109
Additions, Other additions	0	0	0
Deductions	124	118	116
Balance as of end of period	90	77	77
Allowance for deferred tax assets
Valuation allowances and qualifying accounts
Balance as of beginning of period	0	0	0
Additions, Charged to costs and expenses	0	0	0
Additions, Other additions	0	0	0
Deductions	0	0	0
Balance as of end of period	0	0	0
Allowance for estimated losses on mortgage loans
Valuation allowances and qualifying accounts
Balance as of beginning of period	3	3	3
Additions, Charged to costs and expenses	0	0	1
Additions, Other additions	0	0	0
Deductions	0	0	1
Balance as of end of period	3	3	3
Allowance for estimated losses on agent loans
Valuation allowances and qualifying accounts
Balance as of beginning of period	2	2
Additions, Charged to costs and expenses	1	0
Additions, Other additions	0	0
Deductions	0	0
Balance as of end of period	$ 3	$ 2	$ 2