Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities
Net income	$ 2,301	$ 1,506
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized capital gains	(51)	(5)
Equity in net earnings	(33)	(15)
Stock-based compensation	82	76
Depreciation	252	240
Amortization	43	36
Benefit for deferred income taxes	(3)	(21)
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	(1,185)	123
Other assets	(2,124)	(548)
Benefits payable	1,976	980
Other liabilities	2,267	(116)
Unearned revenues	19	29
Other	(3)	45
Net cash provided by operating activities	3,541	2,330
Cash flows from investing activities
Acquisitions, net of cash acquired	(709)	0
Purchases of property and equipment	(418)	(296)
Purchases of investment securities	(5,464)	(3,135)
Maturities of investment securities	1,645	894
Proceeds from sales of investment securities	2,084	2,626
Net cash (used in) provided by investing activities	(2,862)	89
Cash flows from financing activities
Receipts from contract deposits, net	389	473
Proceeds from issuance of senior notes, net	1,088	0
Proceeds (repayments) from issuance of commercial paper, net	21
Proceeds (repayments) from issuance of commercial paper, net		(356)
Proceeds from term loan	1,000	0
Change in book overdraft	85	33
Common stock repurchases	(25)	(10)
Dividends paid	(156)	(142)
Proceeds from stock option exercises and other, net	28	18
Net cash provided by financing activities	2,430	16
Increase in cash and cash equivalents	3,109	2,435
Cash and cash equivalents at beginning of period	4,054	2,343
Cash and cash equivalents at end of period	7,163	4,778
Supplemental cash flow disclosures:
Interest payments	115	110
Income tax payments, net	$ 36	$ 346