Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities
Net income	$ 2,195	$ 1,328
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on sale of business	0	786
Net realized capital gains	(23)	(90)
Equity in net earnings of Kindred at Home	(16)	(9)
Stock-based compensation	119	105
Depreciation	382	330
Amortization	53	70
(Benefit) provision for deferred income taxes	(21)	165
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	179	(211)
Other assets	334	(939)
Benefits payable	1,358	410
Other liabilities	168	548
Unearned revenues	(9)	(84)
Other	53	97
Net cash provided by operating activities	4,772	2,506
Cash flows from investing activities
Cash transferred in sale of business	0	(805)
Acquisitions, net of cash acquired	0	(354)
Acquisition, equity method investment in Kindred at Home	0	(1,095)
Purchases of property and equipment	(506)	(436)
Purchases of investment securities	(4,130)	(3,379)
Maturities of investment securities	1,281	815
Proceeds from sales of investment securities	2,878	2,614
Net cash used in investing activities	(477)	(2,640)
Cash flows from financing activities
Receipts from contract deposits, net	11	378
Proceeds from issuance of senior notes, net	987	0
(Repayments) proceeds from issuance of commercial paper, net	(358)	240
Repayment of term loan	(650)	0
Change in book overdraft	102	58
Common stock repurchases	(1,010)	(294)
Dividends paid	(216)	(195)
Proceeds from stock option exercises and other, net	23	47
Net cash (used in) provided by financing activities	(1,111)	234
Increase in cash and cash equivalents	3,184	100
Cash and cash equivalents at beginning of period	2,343	4,042
Cash and cash equivalents at end of period	5,527	4,142
Supplemental cash flow disclosures:
Interest payments	136	120
Income tax payments, net	$ 578	$ 511