Summary of Significant Accounting Policies - Adjusted Cash Flows to Apply Adopted Guidance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income	$ 3,878	$ 11,273	$ 10,906
Noncash revenues, expenses, gains and losses included in income (loss):
Unrealized (gains) losses in earnings - net	1,674	1,094	(873)
Change in the fair value of market risk benefits in earnings, net	(348)	(1,481)	(1,427)
Depreciation and other amortization	4,214	4,409	4,542
Changes in operating assets and liabilities:
Insurance reserves	1,593	(3,837)	4,472
Premiums and other receivables and payables - net	391	(10,222)	(724)
Reinsurance assets, net	472	3,978	(1,044)
Capitalization of deferred policy acquisition costs	(5,419)	(4,722)	(4,969)
Current and deferred income taxes - net	(1,003)	2,279	1,579
Other, net	418	156	(1,534)
Total adjustments	2,365	(7,140)	(4,683)
Net cash provided by operating activities	6,243	4,134	6,223
Cash flows from financing activities:
Policyholder contract deposits	33,015	26,582	25,480
Policyholder contract withdrawals	(27,957)	(20,722)	(22,481)
Net cash provided by (used in) financing activities	$ 782	(602)	(3,679)
As Previously Reported
Cash flows from operating activities:
Net income		11,275	9,923
Noncash revenues, expenses, gains and losses included in income (loss):
Unrealized (gains) losses in earnings - net		(1,392)	(1,889)
Change in the fair value of market risk benefits in earnings, net		0	0
Depreciation and other amortization		4,848	4,633
Changes in operating assets and liabilities:
Insurance reserves		(2,332)	5,127
Premiums and other receivables and payables - net		(10,193)	(655)
Reinsurance assets, net		2,843	(1,241)
Capitalization of deferred policy acquisition costs		(4,649)	(4,906)
Current and deferred income taxes - net		2,260	1,314
Other, net		340	(1,322)
Total adjustments		(7,069)	(3,644)
Net cash provided by operating activities		4,207	6,279
Cash flows from financing activities:
Policyholder contract deposits		26,508	25,424
Net cash provided by (used in) financing activities		(676)	(3,735)
Effect of Change
Cash flows from operating activities:
Net income		(2)	983
Noncash revenues, expenses, gains and losses included in income (loss):
Unrealized (gains) losses in earnings - net		2,486	1,016
Change in the fair value of market risk benefits in earnings, net		(1,481)	(1,427)
Depreciation and other amortization		(439)	(91)
Changes in operating assets and liabilities:
Insurance reserves		(1,505)	(655)
Premiums and other receivables and payables - net		(29)	(69)
Reinsurance assets, net		1,135	197
Capitalization of deferred policy acquisition costs		(73)	(63)
Current and deferred income taxes - net		19	265
Other, net		(184)	(212)
Total adjustments		(71)	(1,039)
Net cash provided by operating activities		(73)	(56)
Cash flows from financing activities:
Policyholder contract deposits		74	56
Net cash provided by (used in) financing activities		$ 74	$ 56