Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net income		$ 1,627	$ 1,416
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Losses (gains) on investment securities, net		137	(86)
Equity in net losses (earnings)		2	(54)
Stock-based compensation		93	84
Depreciation		369	308
Amortization		45	30
Impairment on property and equipment		140	0
Provision for deferred income taxes		167	0
Changes in operating assets and liabilities, net of effect of businesses acquired:
Receivables		(1,733)	(1,285)
Other assets		(655)	(879)
Benefits payable		1,361	300
Other liabilities		(333)	(301)
Unearned revenues		10	5
Other		31	(15)
Net cash provided by (used in) operating activities		1,261	(477)
Cash flows from investing activities
Acquisitions, net of cash and cash equivalents acquired		(167)	(325)
Purchases of property and equipment, net		(574)	(619)
Purchases of investment securities		(3,239)	(5,307)
Proceeds from maturities of investment securities		947	1,627
Proceeds from sales of investment securities		1,363	2,421
Net cash used in investing activities		(1,670)	(2,203)
Cash flows from financing activities
Receipts from contract deposits, net		3,076	1,183
Proceeds from issuance of senior notes, net		744	0
(Repayments) proceeds from issuance of commercial paper, net		(418)	508
Debt issue costs		(2)	(21)
Change in book overdraft		65	(84)
Common stock repurchases		(1,028)	(33)
Dividends paid		(191)	(173)
Other		(11)	5
Net cash provided by financing activities		2,235	1,385
Increase (decrease) in cash and cash equivalents		1,826	(1,295)
Cash and cash equivalents at beginning of period		3,394	4,673
Cash and cash equivalents at end of period	[1]	5,220	3,378
Supplemental cash flow disclosures:
Interest payments		171	132
Income tax payments, net		373	386
Details of businesses acquired in purchase transactions:
Fair value of assets acquired, net of cash and cash equivalents acquired		190	602
Less: Fair value of liabilities assumed		(23)	(277)
Cash paid for acquired businesses, net of cash and cash equivalents acquired		$ 167	$ 325

[1] Includes $67 million of cash and cash equivalents classified as held-for-sale at June 30, 2022.