Shareholders' Equity - Progression of the components of accumulated other comprehensive income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance			$ 119
Other comprehensive income (loss), pretax	$ (275)	$ (985)	(593)	$ (1,371)
Other comprehensive income (loss), tax	58	208	126	288
Other comprehensive income (loss)	(217)	(777)	(467)	(1,083)
AOCI ending balance	(348)		(348)
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period, pretax	(286)	168	(599)	(187)
Unrealized holding gains (losses) on securities arising during the period, tax	61	(35)	127	39
Unrealized holding gains (losses) on securities arising during the period, after tax	225	(133)	472	148
Reclassification adjustment for realized (gains) losses included in net earnings, pretax	11	(9)	13	(23)
Reclassification adjustment for realized (gains) losses included in net earnings, tax	(3)	2	(3)	5
Reclassification adjustment for realized (gains) losses included in net earnings, after tax	8	(7)	10	(18)
Reclassification adjustment for unrealized gains (losses) on securities of subsidiaries sold, pretax		(1,119)		(1,119)
Reclassification adjustment for unrealized gains (losses) on securities of subsidiaries sold, tax		235		235
Reclassification adjustment for unrealized gains (losses) on securities of subsidiaries sold, after tax	0	(884)	0	(884)
Total net unrealized gains (losses) on securities, pretax	(275)	(960)	(586)	(1,329)
Total net unrealized gains (losses) on securities, tax	58	202	124	279
Total net unrealized gains (losses) on securities	(217)	(758)	(462)	(1,050)
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Unrealized holding gains (losses) on cash flow hedges arising during the period, pretax		7		(1)
Unrealized holding gains (losses) on cash flow hedges arising during the period, tax		(1)		0
Unrealized holding gains (losses) on cash flow hedges arising during the period, after tax	(2)	6	(6)	(1)
Reclassification adjustment for investment income included in net earnings from discontinued operations, pretax		(5)		(14)
Reclassification adjustment for investment income included in net earnings from discontinued operations, tax		1		3
Reclassification adjustment for investment income included in net earnings from discontinued operations, after tax	(2)	(4)	(2)	(11)
Reclassification for unrealized gains on cash flow hedges of subsidiaries sold, pretax		(37)		(37)
Reclassification for unrealized gains on cash flow hedges of subsidiaries sold, tax		8		8
Reclassification for unrealized gains on cash flow hedges of subsidiaries sold, after tax	0	(29)	0	(29)
Total net unrealized gains (losses) on cash flow hedges, pretax	(5)	(35)	(10)	(52)
Total net unrealized gains (losses) on cash flow hedges, tax	1	8	2	11
Total net unrealized gains (losses) on cash flow hedges	(4)	(27)	(8)	(41)
Foreign currency translation adjustments, pretax	5	0	3	0
Foreign currency translation adjustments, tax	(1)	0	0	0
Foreign currency translation adjustments	4	0	3	0
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)		(1)
Unrealized holding gains (losses) on pension and OPRP arising during the period, tax		0		0
Unrealized holding gains (losses) on pension and OPRP arising during the period, after tax	0	(1)	0	(1)
Reclassification adjustment for pension settlement loss included in other expense in net earnings, pretax		11		11
Reclassification adjustment for pension settlement loss included in other expense in net earnings, tax		(2)		(2)
Reclassification adjustment for pension settlement loss included in net earnings	0	9	0	9
Total pension and OPRP adjustments, pretax	0	10	0	10
Total pension and OPRP adjustments, tax	0	(2)	0	(2)
Total pension and OPRP adjustments	0	8	0	8
Accumulated net investment gain (loss) attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(109)	963	136	1,255
AOCI ending balance	(326)	205	(326)	205
Accumulated gain (loss), net, cash flow hedge, parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(4)	27	0	41
AOCI ending balance	(8)	0	(8)	0
Accumulated foreign currency adjustment attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(19)	(16)	(18)	(16)
AOCI ending balance	(15)	(16)	(15)	(16)
Accumulated defined benefit plans adjustment attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	1	(7)	1	(7)
AOCI ending balance	1	1	1	1
AOCI attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(131)	967	119	1,273
AOCI ending balance	$ (348)	$ 190	$ (348)	$ 190