Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income	$ 1,506	$ 684
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on sale of business	0	790
Net realized capital gains	(5)	(82)
Equity in net earnings of Kindred at Home	(15)	0
Stock-based compensation	76	69
Depreciation	240	218
Amortization	36	51
Benefit for deferred income taxes	(21)	(304)
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	123	(619)
Other assets	(548)	(1,658)
Benefits payable	980	410
Other liabilities	(116)	680
Unearned revenues	29	3,252
Other	45	70
Net cash provided by operating activities	2,330	3,561
Cash flows from investing activities
Acquisitions, net of cash acquired	0	(354)
Purchases of property and equipment	(296)	(272)
Purchases of investment securities	(3,135)	(2,624)
Maturities of investment securities	894	555
Proceeds from sales of investment securities	2,626	2,408
Net cash provided by (used in) investing activities	89	(287)
Cash flows from financing activities
Receipts from contract deposits, net	473	1,515
(Repayments) proceeds from issuance of commercial paper, net	(356)	243
Change in book overdraft	33	(67)
Common stock repurchases	(10)	(93)
Dividends paid	(142)	(126)
Proceeds from stock option exercises and other, net	18	43
Net cash provided by financing activities	16	1,515
Increase in cash and cash equivalents	2,435	4,789
Cash and cash equivalents at beginning of period	2,343	4,042
Cash and cash equivalents at end of period	4,778	8,831
Supplemental cash flow disclosures:
Interest payments	110	98
Income tax payments, net	$ 346	$ 405