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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income $ 4,607 $ 4,222
Depreciation and amortization 955 1,042
Share-based compensation expense 147 156
Deferred income taxes (114) (180)
Other items, net 34 109
Changes in operating assets and liabilities, net of acquisition:    
Trade receivables, net (348) (391)
Inventories (135) (90)
Other assets (232) (194)
Accounts payable (329) (43)
Accrued income taxes, net (314) (120)
Long-term tax liability 134 186
Other liabilities 424 14
Net cash provided by operating activities 4,829 4,711
Cash flows from investing activities:    
Purchases of marketable securities (6,733) (19,244)
Proceeds from sales of marketable securities 23,723 14,425
Proceeds from maturities of marketable securities 993 3,284
Cash acquired in acquisition, net of cash paid 197 0
Purchases of property, plant and equipment (342) (353)
Other 6 (82)
Net cash provided by (used in) investing activities 17,844 (1,970)
Cash flows from financing activities:    
Net proceeds from issuance of debt 0 3,485
Repayment of debt (500) (4,405)
Net change in commercial paper 0 959
Repurchases of common stock (13,941) (1,562)
Dividends paid (1,816) (1,693)
Other (85) (137)
Net cash used in financing activities (16,342) (3,353)
Increase (decrease) in cash and cash equivalents 6,331 (612)
Cash and cash equivalents at beginning of period 3,800 3,241
Cash and cash equivalents at end of period $ 10,131 $ 2,629