Summary of Significant Accounting Policies - Adjusted Cash Flows to Apply Adopted Guidance (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities:
Net income (loss)	$ (87)	$ 4,560
Noncash revenues, expenses, gains and losses included in income (loss):
Unrealized gains in earnings - net	(112)	(873)
Change in the fair value of market risk benefits in earnings, net	316	(496)
Depreciation and other amortization	1,186	1,134
Changes in operating assets and liabilities:
Insurance reserves	3,015	1,256
Premiums and other receivables and payables - net	641	(4,166)
Reinsurance assets, net	(2,561)	(807)
Capitalization of deferred policy acquisition costs	(1,689)	(1,402)
Current and deferred income taxes - net	(200)	1,098
Other, net	(463)	(299)
Total adjustments	584	(4,521)
Net cash provided by operating activities	497	39
Cash flows from financing activities:
Policyholder contract deposits	8,226	6,410
Policyholder contract withdrawals	(6,468)	(4,802)
Net cash provided by (used in) financing activities	$ 817	(577)
As Previously Reported
Cash flows from operating activities:
Net income (loss)		4,656
Noncash revenues, expenses, gains and losses included in income (loss):
Unrealized gains in earnings - net		(2,006)
Change in the fair value of market risk benefits in earnings, net		0
Depreciation and other amortization		1,447
Changes in operating assets and liabilities:
Insurance reserves		1,734
Premiums and other receivables and payables - net		(4,164)
Reinsurance assets, net		(1,223)
Capitalization of deferred policy acquisition costs		(1,386)
Current and deferred income taxes - net		1,123
Other, net		(158)
Total adjustments		(4,599)
Net cash provided by operating activities		57
Cash flows from financing activities:
Policyholder contract deposits		6,392
Net cash provided by (used in) financing activities		(595)
Effect of Change
Cash flows from operating activities:
Net income (loss)		(96)
Noncash revenues, expenses, gains and losses included in income (loss):
Unrealized gains in earnings - net		1,133
Change in the fair value of market risk benefits in earnings, net		(496)
Depreciation and other amortization		(313)
Changes in operating assets and liabilities:
Insurance reserves		(478)
Premiums and other receivables and payables - net		(2)
Reinsurance assets, net		416
Capitalization of deferred policy acquisition costs		(16)
Current and deferred income taxes - net		(25)
Other, net		(141)
Total adjustments		78
Net cash provided by operating activities		(18)
Cash flows from financing activities:
Policyholder contract deposits		18
Net cash provided by (used in) financing activities		$ 18