Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net income	$ 4,222	$ 3,770
Depreciation and amortization	1,042	1,043
Share-based compensation expense	156	139
Deferred income taxes	(180)	245
Other items, net	109	42
Changes in operating assets and liabilities:
Trade receivables, net	(391)	(119)
Inventories	(90)	(156)
Other assets	(194)	(330)
Accounts payable	(43)	(100)
Accrued income taxes	(120)	(328)
Other liabilities	200	386
Net cash provided by operating activities	4,711	4,592
Cash flows from investing activities:
Purchases of property, plant and equipment	(353)	(344)
Purchases of intangible assets	0	(99)
Purchases of marketable securities	(19,244)	(14,969)
Proceeds from sales of marketable securities	14,425	9,063
Proceeds from maturities of marketable securities	3,284	1,339
Other	(82)	(37)
Net cash used in investing activities	(1,970)	(5,047)
Cash flows from financing activities:
Net proceeds from issuance of debt	3,485	2,908
Repayment of debt	(4,405)	(1,000)
Net change in commercial paper	959	0
Repurchases of common stock	(1,562)	(1,218)
Dividends paid	(1,693)	(1,504)
Other	(137)	(245)
Net cash used in financing activities	(3,353)	(1,059)
Decrease in cash and cash equivalents	(612)	(1,514)
Cash and cash equivalents at beginning of period	3,241	4,144
Cash and cash equivalents at end of period	$ 2,629	$ 2,630