Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities
Net income	$ 1,328	$ 2,264
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on sale of business	786	0
Net realized capital gains	(90)	(28)
Equity in net earnings of Kindred at Home	(9)	0
Stock-based compensation	105	116
Depreciation	330	303
Other intangible amortization	70	54
Provision (benefit) for deferred income taxes	165	(54)
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	(211)	358
Other assets	(939)	(369)
Benefits payable	410	396
Other liabilities	548	641
Unearned revenues	(84)	3,167
Other, net	97	114
Net cash provided by operating activities	2,506	6,962
Cash flows from investing activities
Cash transferred in sale of business	(805)	0
Acquisitions, net of cash acquired	(354)	(10)
Acquisition, equity method investment in Kindred at Home	(1,095)	0
Purchases of property and equipment, net	(436)	(376)
Purchases of investment securities	(3,379)	(4,337)
Maturities of investment securities	815	919
Proceeds from sales of investment securities	2,614	2,028
Net cash used in investing activities	(2,640)	(1,776)
Cash flows from financing activities
Receipts from contract deposits, net	378	1,931
Proceeds from issuance of senior notes, net	0	985
Proceeds (repayment) from issuance of commercial paper, net	240	(153)
Change in book overdraft	58	(41)
Common stock repurchases	(294)	(1,819)
Dividends paid	(195)	(162)
Proceeds from stock option exercises and other	47	61
Net cash provided by financing activities	234	802
Increase in cash and cash equivalents	100	5,988
Cash and cash equivalents at beginning of period	4,042	3,877
Cash and cash equivalents at end of period	4,142	9,865
Supplemental cash flow disclosures:
Interest payments	120	124
Income tax payments, net	$ 511	$ 1,206