Accumulated Other Comprehensive Loss (Reconciliation Of The Components Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Loss, Beginning Balance	$ (2,490)	$ (197)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax	427	(1,069)
Other comprehensive (income) loss attributable to noncontrolling interests	(2)	5
Cash flow hedges, holding gain (loss), net of tax	11	3
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	2	7
Change in future policy benefits, net of tax	(2)	(9)
Foreign currency translation adjustment, net of tax	2	(3)
Other Comprehensive Income (Loss), Net of Tax	442	(1,054)
Accumulated Other Comprehensive Loss, Ending Balance	(2,050)	(1,246)
Other Comprehensive Income (Loss), Tax (Expense) Benefit, Portion Attributable to Parent	(106)	336
Other Comprehensive Income (Loss), Tax, Portion Attributable to Noncontrolling Interest	0	(2)
Net unrealized investment (losses) gains
AOCI, Debt Securities, Beginning Balance	(1,755)	494
OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax	337	(1,146)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax	90	77
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment and Tax	427	(1,069)
Other comprehensive (income) loss attributable to noncontrolling interests	(2)	5
AOCI, Debt Securities, Ending Balance	(1,330)	(570)
Net holding gain (loss) on investment securities arising during the period, tax (expense) benefit	(85)	355
Reclassification adjustment for net realized loss (gain) on investment securities, tax (benefit) expense	(29)	(21)
Non-credit components of impairments on investments [Member]
AOCI, Other than Temporary Impairment, Not Credit Loss, Beginning Balance	(3)	0
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities	(2)	(1)
AOCI, Other than Temporary Impairment, Not Credit Loss, Ending Balance	(5)	(1)
Tax (expense) benefit of non credit impairment on available-for-sale securities recognized in other comprehensive income (loss)	1	1
Net cash flow hedges
AOCI, Cash Flow Hedge, Beginning Balance	(229)	(239)
Cash flow hedges, holding gain (loss), net of tax	11	3
AOCI, Cash Flow Hedge, Ending Balance	(218)	(236)
Cash flow hedges, holding gain (loss), tax (expense) benefit	8	(1)
Pension and other postretirement benefits
AOCI, Defined Benefit Plan, Beginning Balance	(499)	(429)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax	2	7
AOCI, Defined Benefit Plan, Ending Balance	(497)	(422)
Net change in unrecognized periodic benefit costs for defined benefit pension and postretirement benefit plans, tax expense	(1)	(2)
Future Policy Benefits
AOCI, Liability for Future Policy Benefit, After Tax, Beginning Balance	13	(19)
Change in future policy benefits, net of tax	2	9
AOCI, Liability for Future Policy Benefit, After Tax, Ending Balance	15	(10)
Change in future policy benefits, tax expense	0	3
Foreign currency translation adjustments
AOCI, Foreign Currency Translation Adjustment, Net of Tax, Beginning Balance	(17)	(4)
Foreign currency translation adjustment, net of tax	2	(3)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance	(15)	(7)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax (Expense) Benefit	$ 0	$ 1