Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Net income	$ 1,015	$ 1,175
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of business	0	(267)
Net realized capital gains	(65)	(88)
Stock-based compensation	76	92
Depreciation	289	263
Other intangible amortization	59	72
Provision for deferred income taxes	54	13
Changes in operating assets and liabilities, net of effect of businesses acquired and dispositions:
Receivables	396	56
Other assets	(419)	(1,080)
Benefits payable	73	447
Other liabilities	127	(140)
Unearned revenues	2,987	(64)
Other, net	117	52
Net cash provided by operating activities	4,709	531
Cash flows from investing activities
Proceeds from sale of business	0	1,055
Acquisitions, net of cash acquired	(7)	(38)
Purchases of property and equipment	(395)	(384)
Purchases of investment securities	(4,533)	(4,345)
Maturities of investment securities	1,082	881
Proceeds from sales of investment securities	3,319	3,448
Net cash (used in) provided by investing activities	(534)	617
Cash flows from financing activities
Receipts (withdrawals) from contract deposits, net	350	(984)
Proceeds (repayment) of commercial paper, net	(1)	10
Change in book overdraft	(118)	(38)
Common stock repurchases	(75)	(380)
Dividends paid	(133)	(129)
Excess tax benefit from stock-based compensation	0	15
Proceeds from stock option exercises and other	0	20
Net cash provided by (used in) financing activities	23	(1,486)
Increase (decrease) in cash and cash equivalents	4,198	(338)
Cash and cash equivalents at beginning of period	2,571	1,935
Cash and cash equivalents at end of period	6,769	1,597
Supplemental cash flow disclosures:
Interest payments	102	105
Income tax payments, net	$ 851	$ 1,038