Shareholders' Equity - Progression of the components of accumulated other comprehensive income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	$ 1,273
Other comprehensive income (loss), pretax	(1,460)	$ 527	$ 1,030
Other comprehensive income (loss), tax	306	(111)	(215)
Other comprehensive income (loss)	(1,154)	416	815
Accumulated other comprehensive income, net of tax	119	1,273
AOCI ending balance	119	1,273
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period, pretax	(275)	887	997
Unrealized holding gains (losses) on securities arising during the period, tax	57	(187)	(209)
Unrealized holding gains (losses) on securities arising during the period, after tax	218	(700)	(788)
Reclassification adjustment for realized (gains) losses included in net earnings, pretax	(22)	(389)	(11)
Reclassification adjustment for realized (gains) losses included in net earnings, tax	5	82	2
Reclassification adjustment for realized (gains) losses included in net earnings, after tax	(17)	(307)	(9)
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	(884)	0	0
Total net unrealized gains (losses) on securities, pretax	(1,416)	498	986
Total net unrealized gains (losses) on securities, tax	297	(105)	(207)
Total net unrealized gains (losses) on securities	(1,119)	393	779
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Unrealized holding gains (losses) on cash flow hedges arising during the period, pretax	(1)	70	39
Unrealized holding gains (losses) on cash flow hedges arising during the period, tax	0	(14)	(8)
Unrealized holding gains (losses) on cash flow hedges arising during the period, after tax	(1)	56	31
Reclassification adjustment for investment income included in net earnings from discontinued operations, pretax	(14)	(40)	(3)
Reclassification adjustment for investment income included in net earnings from discontinued operations, tax	3	8	0
Reclassification adjustment for investment income included in net earnings from discontinued operations, after tax	(11)	(32)	(3)
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	(29)	0	0
Total net unrealized gains (losses) on cash flow hedges, pretax	(52)	30	36
Total net unrealized gains (losses) on cash flow hedges, tax	11	(6)	(8)
Total net unrealized gains (losses) on cash flow hedges	(41)	24	28
Foreign currency translation adjustments, pretax	(2)	(1)	7
Foreign currency translation adjustments, tax	0	0	0
Foreign currency translation adjustments	(2)	(1)	7
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	(1)	(1)	0
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	9	1	1
Total pension and OPRP adjustments, pretax	10	0	1
Total pension and OPRP adjustments, tax	(2)	0	0
Total pension and OPRP adjustments	8	0	1
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	(2)	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, 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)	(1,154)	414	815
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period, after tax	218	(700)	(788)
Reclassification adjustment for realized (gains) losses included in net earnings, after tax	(17)	(307)	(9)
Reclassification adjustment for unrealized gains (losses) on securities of subsidiaries sold, after tax	(884)
Total net unrealized gains (losses) on securities	(1,119)	393	779
Reclassification of Cash Flow Hedge Gain (Loss) [Abstract]
Unrealized holding gains (losses) on cash flow hedges arising during the period, after tax	(1)	56	31
Reclassification adjustment for investment income included in net earnings from discontinued operations, after tax	(11)	(32)	(3)
Reclassification for unrealized gains on cash flow hedges of subsidiaries sold, after tax	(29)
Total net unrealized gains (losses) on cash flow hedges	(41)	24	28
Foreign currency translation adjustments	(2)	(3)	7
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	8	0	1
Accumulated net investment gain (loss) attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	1,255	862	83
Accumulated other comprehensive income, net of tax	136	1,255	862
AOCI ending balance	136	1,255	862
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	41	17	(11)
Accumulated other comprehensive income, net of tax	0	41	17
AOCI ending balance	0	41	17
Accumulated foreign currency adjustment attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(16)	(9)	(16)
Accumulated other comprehensive income, net of tax	(18)	(16)	(9)
AOCI ending balance	(18)	(16)	(9)
Accumulated foreign currency adjustment attributable to parent | Neon Capital Limited
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(4)
Accumulated other comprehensive income, 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	(7)	(7)	(8)
Accumulated other comprehensive income, net of tax	1	(7)	(7)
AOCI ending balance	1	(7)	(7)
AOCI attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	1,273	863	48
Other comprehensive income (loss)	(1,154)	414	815
Accumulated other comprehensive income, net of tax	119	1,273	863
AOCI ending balance	119	1,273	863
AOCI attributable to parent | Neon Capital Limited
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(4)
Accumulated other comprehensive income, net of tax		(4)
AOCI ending balance		(4)
AOCI attributable to noncontrolling interest
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss)	$ 0	$ (2)	$ 0