Schedule V Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Movement in Valuation allowance and reserves
Balance January 1,	$ 135
Balance December 31,	145	$ 135
Allowance for doubtful accounts and other
Movement in Valuation allowance and reserves
Balance January 1,	135	132	$ 137
Increase (decrease) in Costs and Expenses	42	40	42
Write-offs/ Payments/ Other	(32)	(37)	(47)
Balance December 31,	145	135	132
Allowance for uncollectible reinsurance
Movement in Valuation allowance and reserves
Balance January 1,	126	104	165
Increase (decrease) in Costs and Expenses	2	3	4
Write-offs/ Payments/ Other	(14)	19	(65)
Balance December 31,	114	126	104
Valuation allowance on mortgage loans
Movement in Valuation allowance and reserves
Balance January 1,	1	1	0
Increase (decrease) in Costs and Expenses	(1)	0	1
Write-offs/ Payments/ Other	0	0	0
Balance December 31,	0	1	1
Valuation allowance for deferred taxes
Movement in Valuation allowance and reserves
Balance January 1,	0	0	0
Increase (decrease) in Costs and Expenses	0	0	0
Write-offs/ Payments/ Other	4	0	0
Balance December 31,	$ 4	$ 0	$ 0