CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Cash flows from operating activities
Net income	$ 1,979,000,000	$ 1,897,000,000
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on sale of business	63,000,000	0
Gain on investment securities, net	(66,000,000)	(10,000,000)
Equity in net losses	88,000,000	57,000,000
Stock-based compensation	193,000,000	153,000,000
Depreciation	587,000,000	682,000,000
Amortization	43,000,000	46,000,000
Impairment of property and equipment	14,000,000	129,000,000
Impairment of indefinite-lived intangible assets	32,000,000	0
Changes in operating assets and liabilities, net of effect of businesses acquired and disposed:
Receivables	16,000,000	(109,000,000)
Other assets	(1,374,000,000)	258,000,000
Benefits payable	(351,000,000)	884,000,000
Other liabilities	1,317,000,000	(498,000,000)
Unearned revenues	5,000,000	(71,000,000)
Other	27,000,000	76,000,000
Net cash provided by operating activities	2,573,000,000	3,494,000,000
Cash flows from investing activities
Proceeds from sale of business, net	115,000,000	0
Acquisitions, net of cash and cash equivalents acquired	(5,000,000)	(37,000,000)
Purchases of property and equipment, net	(344,000,000)	(421,000,000)
Purchases of investment securities	(5,198,000,000)	(6,042,000,000)
Proceeds from maturities of investment securities	2,148,000,000	2,214,000,000
Proceeds from sales of investment securities	5,066,000,000	1,758,000,000
Changes in securities lending collateral receivable	(141,000,000)	(361,000,000)
Net cash provided by (used in) investing activities	1,641,000,000	(2,889,000,000)
Cash flows from financing activities
Payments from contract deposits, net	(1,164,000,000)	(638,000,000)
Proceeds from issuance of senior notes, net	1,481,000,000	2,232,000,000
Repayments of senior notes	(771,000,000)	(48,000,000)
Repayments from issuance of commercial paper, net	(5,000,000)	(895,000,000)
Debt issue costs	(5,000,000)	(7,000,000)
Change in book overdraft	(95,000,000)	3,000,000
Common stock repurchases	(109,000,000)	(768,000,000)
Dividends paid	(321,000,000)	(323,000,000)
Changes in securities lending payable	141,000,000	361,000,000
Changes in rebate factor payable	(123,000,000)	0
Other	(76,000,000)	(100,000,000)
Net cash used in financing activities	(1,047,000,000)	(183,000,000)
Increase in cash and cash equivalents	3,167,000,000	422,000,000
Cash and cash equivalents at beginning of period	2,221,000,000	4,694,000,000
Cash and cash equivalents at end of period	5,388,000,000	5,116,000,000
Supplemental cash flow disclosures:
Interest payments	440,000,000	416,000,000
Income tax payments, net	151,000,000	570,000,000
Details of businesses acquired in purchase transactions:
Fair value of assets acquired, net of cash and cash equivalents acquired	6,000,000	49,000,000
Less: Fair value of liabilities assumed	(1,000,000)	(12,000,000)
Cash paid for acquired businesses, net of cash and cash equivalents acquired	$ 5,000,000	$ 37,000,000