Shareholders' Equity - Progression of the components of accumulated other comprehensive income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	$ 119
Other comprehensive income (loss), pretax	(839)	$ (1,460)	$ 527
Other comprehensive income (loss), tax	177	306	(111)
Other comprehensive income (loss)	(662)	(1,154)	416
Accumulated other comprehensive income (loss), net of tax	(543)	119
AOCI ending balance	(543)	119
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period, pretax	(821)	(275)	887
Unrealized holding gains (losses) on securities arising during the period, tax	174	57	(187)
Unrealized holding gains (losses) on securities arising during the period, after tax	647	218	(700)
Reclassification adjustment for realized (gains) losses included in net earnings, pretax	18	(22)	(389)
Reclassification adjustment for realized (gains) losses included in net earnings, tax	(4)	5	82
Reclassification adjustment for realized (gains) losses included in net earnings, after tax	14	(17)	(307)
Reclassification adjustment for unrealized gains (losses) on securities of subsidiaries sold, pretax		(1,119)
Reclassification adjustment for unrealized gains (losses) on securities of subsidiaries sold, tax		235
Reclassification adjustment for unrealized gains (losses) on securities of subsidiaries sold, after tax	0	(884)	0
Total net unrealized gains (losses) on securities, pretax	(803)	(1,416)	498
Total net unrealized gains (losses) on securities, tax	170	297	(105)
Total net unrealized gains (losses) on securities	(633)	(1,119)	393
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Unrealized holding gains (losses) on cash flow hedges arising during the period, pretax	(37)	(1)	70
Unrealized holding gains (losses) on cash flow hedges arising during the period, tax	8	0	(14)
Unrealized holding gains (losses) on cash flow hedges arising during the period, after tax	(29)	(1)	56
Reclassification adjustment for investment income included in net earnings from discontinued operations, pretax	0	(14)	(40)
Reclassification adjustment for investment income included in net earnings from discontinued operations, tax	0	3	8
Reclassification adjustment for investment income included in net earnings from discontinued operations, after tax	0	(11)	(32)
Reclassification for unrealized gains on cash flow hedges of subsidiaries sold, pretax		(37)
Reclassification for unrealized gains on cash flow hedges of subsidiaries sold, tax		8
Reclassification for unrealized gains on cash flow hedges of subsidiaries sold, after tax	0	(29)	0
Total net unrealized gains (losses) on cash flow hedges, pretax	(37)	(52)	30
Total net unrealized gains (losses) on cash flow hedges, tax	8	11	(6)
Total net unrealized gains (losses) on cash flow hedges	(29)	(41)	24
Foreign currency translation adjustments, pretax	(1)	(2)	(1)
Foreign currency translation adjustments, tax	(1)	0	0
Foreign currency translation adjustments	(2)	(2)	(1)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent [Abstract]
Unrealized holding gains (losses) on pension and OPRP arising during the period, pretax		(1)
Unrealized holding gains (losses) on pension and OPRP arising during the period, tax		0
Unrealized holding gains (losses) on pension and OPRP arising during the period, after tax	2	(1)	(1)
Reclassification adjustment for pension settlement loss included in other expense in net earnings, pretax		11
Reclassification adjustment for pension settlement loss included in other expense in net earnings, tax		(2)
Reclassification adjustment for pension settlement loss included in net earnings	0	9	1
Total pension and OPRP adjustments, pretax	2	10	0
Total pension and OPRP adjustments, tax	0	(2)	0
Total pension and OPRP adjustments	2	8	0
Noncontrolling Interests
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss)	0	0	0
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period, after tax	0	0	0
Reclassification adjustment for realized (gains) losses included in net earnings, after tax	0	0	0
Reclassification adjustment for unrealized gains (losses) on securities of subsidiaries sold, after tax		0
Total net unrealized gains (losses) on securities	0	0	0
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Unrealized holding gains (losses) on cash flow hedges arising during the period, after tax	0	0	0
Reclassification adjustment for investment income included in net earnings from discontinued operations, after tax	0	0	0
Reclassification for unrealized gains on cash flow hedges of subsidiaries sold, after tax		0
Total net unrealized gains (losses) on cash flow hedges	0	0	0
Foreign currency translation adjustments	0	0	(2)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent [Abstract]
Unrealized holding gains (losses) on pension and OPRP arising during the period, after tax		0
Reclassification adjustment for pension settlement loss included in net earnings		0
Total pension and OPRP adjustments	0	0	0
AOCI including portion attributable to noncontrolling interest
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss)	(662)	(1,154)	414
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period, after tax	647	218	(700)
Reclassification adjustment for realized (gains) losses included in net earnings, after tax	14	(17)	(307)
Reclassification adjustment for unrealized gains (losses) on securities of subsidiaries sold, after tax		(884)
Total net unrealized gains (losses) on securities	(633)	(1,119)	393
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Unrealized holding gains (losses) on cash flow hedges arising during the period, after tax	(29)	(1)	56
Reclassification adjustment for investment income included in net earnings from discontinued operations, after tax	0	(11)	(32)
Reclassification for unrealized gains on cash flow hedges of subsidiaries sold, after tax		(29)
Total net unrealized gains (losses) on cash flow hedges	(29)	(41)	24
Foreign currency translation adjustments	(2)	(2)	(3)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent [Abstract]
Unrealized holding gains (losses) on pension and OPRP arising during the period, after tax		(1)
Reclassification adjustment for pension settlement loss included in net earnings		9
Total pension and OPRP adjustments	2	8	0
Accumulated net investment gain (loss) attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	136	1,255	862
Accumulated other comprehensive income (loss), net of tax	(497)	136	1,255
AOCI ending balance	(497)	136	1,255
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	0	41	17
Accumulated other comprehensive income (loss), net of tax	(29)	0	41
AOCI ending balance	(29)	0	41
Accumulated foreign currency adjustment attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(18)	(16)	(9)
Accumulated other comprehensive income (loss), net of tax	(20)	(18)	(16)
AOCI ending balance	(20)	(18)	(16)
Accumulated foreign currency adjustment attributable to parent | Neon Capital Limited
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance		(4)
Accumulated other comprehensive income (loss), net of tax			(4)
AOCI ending balance			(4)
Accumulated defined benefit plans adjustment attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	1	(7)	(7)
Accumulated other comprehensive income (loss), net of tax	3	1	(7)
AOCI ending balance	3	1	(7)
AOCI attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	119	1,273	863
Other comprehensive income (loss)	(662)	(1,154)	414
Accumulated other comprehensive income (loss), net of tax	(543)	119	1,273
AOCI ending balance	(543)	119	1,273
AOCI attributable to parent | Neon Capital Limited
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance		(4)
Accumulated other comprehensive income (loss), net of tax			(4)
AOCI ending balance			(4)
AOCI attributable to noncontrolling interest
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss)	$ 0	$ 0	$ (2)