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, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income, Before Tax
Pension obligations OCI	$ 9	$ 68	$ (32)
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	648
AOCI, balance at the end of the period	(636)	648
Accumulated Net Unrealized Investment Gain (Loss)
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	792	1,026	590
OCI before investment gains and losses, net, recognized in net income	(1,642)	(204)	371
Investment gains and losses, net, recognized in net income	3	(30)	65
OCI	(1,639)	(234)	436
AOCI, balance at the end of the period	(847)	792	1,026
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	165	215	123
OCI before investment gains and losses, net, recognized in net income	(347)	(44)	78
Investment gains and losses, net, recognized in net income	0	(6)	14
OCI	(347)	(50)	92
AOCI, balance at the end of the period	(182)	165	215
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	627	811	467
OCI before investment gains and losses, net, recognized in net income	(1,295)	(160)	293
Investment gains and losses, net, recognized in net income	3	(24)	51
OCI	(1,292)	(184)	344
AOCI, balance at the end of the period	(665)	627	811
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	27	(41)	(9)
OCI before investment gains and losses, net, recognized in net income	12	62	(35)
Investment gains and losses, net, recognized in net income	(3)	6	3
OCI	9	68	(32)
AOCI, balance at the end of the period	36	27	(41)
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	7	(7)	0
OCI before investment gains and losses, net, recognized in net income	2	12	(7)
Investment gains and losses, net, recognized in net income	0	2	0
OCI	2	14	(7)
AOCI, balance at the end of the period	9	7	(7)
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	20	(34)	(9)
OCI before investment gains and losses, net, recognized in net income	10	50	(28)
Investment gains and losses, net, recognized in net income	(3)	4	3
OCI	7	54	(25)
AOCI, balance at the end of the period	27	20	(34)
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	1	(10)	(13)
OCI before investment gains and losses, net, recognized in net income	1	11	3
Investment gains and losses, net, recognized in net income	0	0	0
OCI	1	11	3
AOCI, balance at the end of the period	2	1	(10)
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	0	(2)	(3)
OCI before investment gains and losses, net, recognized in net income	0	2	1
Investment gains and losses, net, recognized in net income	0	0	0
OCI	0	2	1
AOCI, balance at the end of the period	0	0	(2)
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	1	(8)	(10)
OCI before investment gains and losses, net, recognized in net income	1	9	2
Investment gains and losses, net, recognized in net income	0	0	0
OCI	1	9	2
AOCI, balance at the end of the period	2	1	(8)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income, Before Tax
AOCI, balance at the beginning of the period	820	975	568
Investments OCI	(1,639)	(234)	436
Pension obligations OCI	9	68	(32)
Life deferred acquisition costs, life policy reserves and other OCI	1	11	3
Total OCI	(1,629)	(155)	407
AOCI, balance at the end of the period	(809)	820	975
Accumulated Other Comprehensive Income, Income Tax
AOCI, balance at the beginning of the period	172	206	120
Investments OCI	(347)	(50)	92
Pension obligations OCI	2	14	(7)
Life deferred acquisition costs, life policy reserves and other OCI	0	2	1
Total OCI	(345)	(34)	86
AOCI, balance at the end of the period	(173)	172	206
Accumulated Other Comprehensive Income, Net of Tax
AOCI, balance at the beginning of the period	648	769	448
Investments OCI	(1,292)	(184)	344
Pension obligations OCI	7	54	(25)
Life deferred acquisition costs, life policy reserves and other OCI	1	9	2
Total OCI	(1,284)	(121)	321
AOCI, balance at the end of the period	$ (636)	$ 648	$ 769