Shareholders' Equity - OCI Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pretax
Total other comprehensive income (loss)	$ (3,361)	$ (811)	$ 568
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	753	177	(119)
Net of Tax
Arising during the period	(2,689)	(207)	459
Reclassification to net income	81	(427)	(10)
Total other comprehensive income (loss), net of tax	(2,608)	(634)	449
Reclassification in net income
Interest and debt expense	198	191	162
Net investment income	1,474	1,683	1,251
Reclassification
Reclassification in net income
Interest and debt expense	1	1	1
Net investment income	0	0	0
Net unrealized gains (losses) on securities
Pretax
Total other comprehensive income (loss)	(3,240)	(861)	622
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	728	188	(133)
Net of Tax
Arising during the period	(2,579)	(230)	498
Reclassification to net income	67	(443)	(9)
Total other comprehensive income (loss), net of tax	(2,512)	(673)	489
Net unrealized gains (losses) on securities arising during the period
Pretax
Arising during the period	(4,146)	(622)	907
Income Tax Benefit (Expense)
Arising during the period	918	137	(192)
Net of Tax
Arising during the period	(3,228)	(485)	715
Reclassification of net (gains) losses on securities included in net income
Pretax
Reclassification to net income	85	(561)	(11)
Income Tax Benefit (Expense)
Reclassification to net income	(18)	118	2
Net of Tax
Reclassification to net income	67	(443)	(9)
Impact of DAC, DSIC, unearned revenue, benefit reserves and reinsurance recoverables
Pretax
Arising during the period	821	322	(274)
Income Tax Benefit (Expense)
Arising during the period	(172)	(67)	57
Net of Tax
Arising during the period	649	255	(217)
Net unrealized gains (losses) on derivatives
Pretax
Reclassification to net income	(1)	(1)	(2)
Total other comprehensive income (loss)	(1)	(1)	(2)
Income Tax Benefit (Expense)
Reclassification to net income	0	0	1
Total other comprehensive income (loss)	0	0	1
Net of Tax
Arising during the period	0	0	0
Reclassification to net income	(1)	(1)	(1)
Total other comprehensive income (loss), net of tax	(1)	(1)	(1)
Defined benefit plans
Pretax
Total other comprehensive income (loss)	96	67	(84)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	(20)	(14)	18
Net of Tax
Arising during the period	61	36	(66)
Reclassification to net income	15	17	0
Total other comprehensive income (loss), net of tax	76	53	(66)
Prior service credits and costs
Pretax
Total other comprehensive income (loss)	(1)	(3)	(2)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	0	1	0
Net of Tax
Total other comprehensive income (loss), net of tax	(1)	(2)	(2)
Net gains (losses)
Pretax
Total other comprehensive income (loss)	97	70	(82)
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	(20)	(15)	18
Net of Tax
Total other comprehensive income (loss), net of tax	77	55	(64)
Foreign currency translation
Pretax
Total other comprehensive income (loss)	(216)	(16)	32
Income Tax Benefit (Expense)
Total other comprehensive income (loss)	45	3	(5)
Net of Tax
Arising during the period	(171)	(13)	27
Reclassification to net income	0	0	0
Total other comprehensive income (loss), net of tax	$ (171)	$ (13)	$ 27