Condensed Financial Information of Registrant - Condensed Statements of Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue:
Revenues	$ 34,072	$ 31,974	$ 27,771
Expenses:
General and administrative expenses	2,462	2,311	2,068
Depreciation and amortization	171	176	131
Impairment	0	208	0
Total operating expenses	32,499	30,801	26,751
Operating income	1,573	1,173	1,020
Interest expense	109	110	120
Other expenses, net	0	0	25
Income tax benefit	373	271	216
Net income	1,091	792	659
Parent Company
Revenue:
Administrative services fees	2,038	1,826	1,496
Investment income and other revenue	27	8	11
Revenues	2,065	1,834	1,507
Expenses:
General and administrative expenses	1,952	1,721	1,424
Depreciation and amortization	131	141	98
Impairment	0	138	0
Other	20	0	5
Total operating expenses	2,103	2,000	1,527
Operating income	(38)	(166)	(20)
Interest expense	109	110	120
Other expenses, net	0	0	25
Total other expenses, net	109	110	145
Loss before income tax benefit and equity in net earnings of subsidiaries	(147)	(276)	(165)
Income tax benefit	(7)	(42)	(21)
Net loss before equity in net earnings of subsidiaries	(140)	(234)	(144)
Equity in net earnings of subsidiaries	1,231	1,026	803
Net income	1,091	792	659
Parent Company | Affiliated Entity
Revenue:
Revenues	$ 2,038	$ 1,826	$ 1,496