Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income	$ 1,366	$ 997
Adjustments to Net income:
Depreciation	137	139
Amortization of acquisition-related intangibles	80	80
Amortization of capitalized software	12	11
Stock compensation	70	68
Deferred taxes	(31)	9
Increase (decrease) from changes in:
Accounts receivable	(176)	(68)
Inventories	(97)	(53)
Prepaid expenses and other current assets	356	(71)
Accounts payable and accrued expenses	(51)	(78)
Accrued compensation	(372)	(356)
Income taxes payable	(131)	149
Changes in funded status of retirement plans	(15)	(14)
Other	(36)	(18)
Cash flows from operating activities	1,112	795
Cash flows from investing activities
Capital expenditures	(189)	(127)
Proceeds from asset sales	0	40
Purchases of short-term investments	(996)	(757)
Proceeds from short-term investments	1,455	1,120
Other	(4)	(9)
Cash flows from investing activities	266	267
Cash flows from financing activities
Repayment of debt	0	(250)
Dividends paid	(611)	(500)
Stock repurchases	(873)	(550)
Proceeds from common stock transactions	178	161
Other	(11)	(4)
Cash flows from financing activities	(1,317)	(1,143)
Net change in Cash and cash equivalents	61	(81)
Cash and cash equivalents at beginning of period	1,656	1,154
Cash and cash equivalents at end of period	$ 1,717	$ 1,073