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	$ 1,992	$ 2,311
Depreciation, amortization and other	495	471
Deferred income taxes	(50)	(72)
Other items, net	24	98
Changes in operating assets and liabilities, net of acquisition:
Trade receivables, net	(207)	(384)
Inventories	(28)	(107)
Other assets	(249)	(135)
Accounts payable	(112)	(278)
Accrued income taxes, net	277	353
Long-term tax liabilities	100	63
Other liabilities	(397)	407
Net cash provided by operating activities	1,845	2,727
Cash flows from investing activities:
Purchases of marketable securities	(6,898)	(2,732)
Proceeds from sales of marketable securities	125	16,694
Proceeds from maturities of marketable securities	10,455	900
Cash acquired in acquisition, net of cash paid	0	197
Purchases of property, plant and equipment	(116)	(155)
Other	(11)	2
Net cash provided by investing activities	3,555	14,906
Cash flows from financing activities:
Repayment of debt	(1,000)	0
Repurchases of common stock	(3,032)	(10,697)
Dividends paid	(901)	(951)
Other	(54)	(44)
Net cash used in financing activities	(4,987)	(11,692)
Increase in cash and cash equivalents	413	5,941
Cash and cash equivalents at beginning of period	6,945	3,800
Cash and cash equivalents at end of period	$ 7,358	$ 9,741