Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities
Net income	$ 566	$ 491
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized capital losses (gains)	2	(29)
Equity in net earnings of Kindred at Home	(3)	0
Stock-based compensation	33	35
Depreciation	118	109
Amortization	18	30
(Benefit) provision for deferred income taxes	(21)	83
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	(940)	(422)
Other assets	(102)	(1,164)
Benefits payable	1,162	293
Other liabilities	16	885
Unearned revenues	29	3,328
Other	18	47
Net cash provided by operating activities	896	3,686
Cash flows from investing activities
Acquisitions, net of cash acquired	0	(169)
Purchases of property and equipment	(139)	(134)
Purchases of investment securities	(2,175)	(1,711)
Maturities of investment securities	397	217
Proceeds from sales of investment securities	2,062	1,392
Net cash provided by (used in) investing activities	145	(405)
Cash flows from financing activities
Receipts from contract deposits, net	554	1,401
Proceeds from issuance of commercial paper, net	17	245
Change in book overdraft	(17)	(17)
Common stock repurchases	(10)	(51)
Dividends paid	(68)	(57)
Proceeds from stock option exercises and other, net	17	11
Net cash provided by financing activities	493	1,532
Increase in cash and cash equivalents	1,534	4,813
Cash and cash equivalents at beginning of period	2,343	4,042
Cash and cash equivalents at end of period	3,877	8,855
Supplemental cash flow disclosures:
Interest payments	29	22
Income tax (refunds) payments, net	$ (22)	$ 4