Investments (Investment Income Realized Investment Gains And Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment income:
Interest	$ 445	$ 445	$ 440
Dividends	181	170	161
Other	5	4	3
Total	631	619	604
Less investment expenses	12	10	9
Total	619	609	595
Gain (Loss) on Sale of Investments	(408)	148	124
Investment gains and losses, net:
Other	(12)	9	2
Total	(402)	148	124
Fixed Maturities
Investment gains and losses, net:
Gross realized gains	12	25	26
Gross realized losses	(2)	0	(1)
Other-than-temporary impairments	(5)	(6)	(2)
Total	5	19	23
Equity Securities
Investment income:
Gain (Loss) on Sale of Investments	9	0	0
Unrealized Gain (Loss) on Investments	(404)	0	0
Investment gains and losses, net:
Gross realized gains	0	195	152
Gross realized losses	0	(72)	(53)
Other-than-temporary impairments	0	(3)	0
Total	$ (395)	$ 120	$ 99