Shareholders' Equity - Progression of the components of accumulated other comprehensive income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance			$ (319)
Other comprehensive income (loss), pretax	$ (18)	$ (77)	(13)	$ 40
Other comprehensive income (loss), tax	2	17	1	(8)
Other comprehensive income (loss), net of tax	(16)	(60)	(12)	32
AOCI ending balance	(331)		(331)
Net unrealized gains (losses) on securities:
Unrealized holding gains (losses) on securities arising during the period, pretax	(16)	(66)	(10)	12
Unrealized holding gains (losses) on securities arising during the period, tax	3	14	2	(3)
Unrealized holding gains (losses) on securities arising during the period, after tax	(13)	(52)	(8)	9
Reclassification adjustment for realized (gains) losses included in net earnings, pretax	1	2	6	31
Reclassification adjustment for realized (gains) losses included in net earnings, tax	0	(1)	(1)	(7)
Reclassification adjustment for realized (gains) losses included in net earnings, after tax	1	1	5	24
Total net unrealized gains (losses) on securities, pretax	(15)	(64)	(4)	43
Total net unrealized gains (losses) on securities, tax	3	13	1	(10)
Total net unrealized gains (losses) on securities	(12)	(51)	(3)	33
Net unrealized gains (losses) on cash flow hedges:
Unrealized holding gains (losses) on cash flow hedges arising during the period, pretax	(5)	(21)	(18)	(16)
Unrealized holding gains (losses) on cash flow hedges arising during the period, tax	1	4	4	3
Unrealized holding gains (losses) on cash flow hedges arising during the period, after tax	(4)	(17)	(14)	(13)
Reclassification adjustment for investment income included in net earnings, pretax	7	6	14	11
Reclassification adjustment for investment income included in net earnings, tax	(1)	(1)	(3)	(2)
Reclassification adjustment for investment income included in net earnings from discontinued operations, after tax	6	5	11	9
Total net unrealized gains (losses) on cash flow hedges, pretax	2	(15)	(4)	(5)
Total net unrealized gains (losses) on cash flow hedges, tax	0	3	1	1
Total net unrealized gains (losses) on cash flow hedges	2	(12)	(3)	(4)
Foreign currency translation adjustments, pretax	(5)	2	(5)	2
Foreign currency translation adjustments, tax	(1)	1	(1)	1
Foreign currency translation adjustments, after tax	(6)	3	(6)	3
Total pension and OPRP adjustments, pretax	0	0	0	0
Total pension and OPRP adjustments, tax	0	0	0	0
Total pension and OPRP adjustments, after Tax	0	0	0	0
AOCI attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(315)	(451)	(319)	(543)
AOCI ending balance	(331)	(511)	(331)	(511)
Accumulated net investment gain (loss) attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(278)	(413)	(287)	(497)
AOCI ending balance	(290)	(464)	(290)	(464)
Accumulated gain (loss), net, cash flow hedge, parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(22)	(21)	(17)	(29)
AOCI ending balance	(20)	(33)	(20)	(33)
Accumulated foreign currency adjustment attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	(17)	(20)	(17)	(20)
AOCI ending balance	(23)	(17)	(23)	(17)
Accumulated defined benefit plans adjustment attributable to parent
Accumulated Other Comprehensive Income [Roll Forward]
AOCI beginning balance	2	3	2	3
AOCI ending balance	$ 2	$ 3	$ 2	$ 3