Shareholders' Equity And Dividend Restrictions (Change In AOCI Includes Changes In Unrealized Gains And Losses On Investments And Pension Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income, Before Tax
Pension obligations OCI	$ 68	$ (32)	$ 7
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	769
AOCI, balance at the end of the period	648	769
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	1,026	590	46
OCI before investment gains and losses, net, recognized in net income	(204)	371	545
Investment gains and losses, net, recognized in net income	(30)	65	(1)
OCI	(234)	436	544
AOCI, balance at the end of the period	792	1,026	590
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	215	123	9
OCI before investment gains and losses, net, recognized in net income	(44)	78	115
Investment gains and losses, net, recognized in net income	(6)	14	(1)
OCI	(50)	92	114
AOCI, balance at the end of the period	165	215	123
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	811	467	37
OCI before investment gains and losses, net, recognized in net income	(160)	293	430
Investment gains and losses, net, recognized in net income	(24)	51	0
OCI	(184)	344	430
AOCI, balance at the end of the period	627	811	467
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	(41)	(9)	(16)
OCI before investment gains and losses, net, recognized in net income	62	(35)	6
Investment gains and losses, net, recognized in net income	6	3	1
OCI	68	(32)	7
AOCI, balance at the end of the period	27	(41)	(9)
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	(7)	0	(2)
OCI before investment gains and losses, net, recognized in net income	12	(7)	2
Investment gains and losses, net, recognized in net income	2	0	0
OCI	14	(7)	2
AOCI, balance at the end of the period	7	(7)	0
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	(34)	(9)	(14)
OCI before investment gains and losses, net, recognized in net income	50	(28)	4
Investment gains and losses, net, recognized in net income	4	3	1
OCI	54	(25)	5
AOCI, balance at the end of the period	20	(34)	(9)
Accumulated Net Unrealized Gain (Loss) on Deferred Costs, Reserves And Other
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	(10)	(13)	(1)
OCI before investment gains and losses, net, recognized in net income	11	3	(15)
Investment gains and losses, net, recognized in net income	0	0	3
OCI	11	3	(12)
AOCI, balance at the end of the period	1	(10)	(13)
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	(2)	(3)	0
OCI before investment gains and losses, net, recognized in net income	2	1	(3)
Investment gains and losses, net, recognized in net income	0	0	0
OCI	2	1	(3)
AOCI, balance at the end of the period	0	(2)	(3)
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	(8)	(10)	(1)
OCI before investment gains and losses, net, recognized in net income	9	2	(12)
Investment gains and losses, net, recognized in net income	0	0	3
OCI	9	2	(9)
AOCI, balance at the end of the period	1	(8)	(10)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	975	568	29
Investments OCI	(234)	436	544
Pension obligations OCI	68	(32)	7
Life deferred acquisition costs, life policy reserves and other OCI	11	3	(12)
Total OCI	(155)	407	539
AOCI, balance at the end of the period	820	975	568
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	206	120	7
Investments OCI	(50)	92	114
Pension obligations OCI	14	(7)	2
Life deferred acquisition costs, life policy reserves and other OCI	2	1	(3)
Total OCI	(34)	86	113
AOCI, balance at the end of the period	172	206	120
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	769	448	22
Investments OCI	(184)	344	430
Pension obligations OCI	54	(25)	5
Life deferred acquisition costs, life policy reserves and other OCI	9	2	(9)
Total OCI	(121)	321	426
AOCI, balance at the end of the period	$ 648	$ 769	$ 448