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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 6,466 $ 6,243
Depreciation and amortization 1,456 1,506
Share-based compensation expense 224 244
Deferred income taxes (294) (379)
Other items, net 412 381
Changes in operating assets and liabilities, net of acquisition:    
Trade receivables, net (234) (229)
Inventories (93) (54)
Other assets (110) (110)
Accounts payable (311) (50)
Accrued income taxes, net (384) 48
Long-term tax liabilities 204 314
Other liabilities 766 251
Net cash provided by operating activities 8,102 8,165
Cash flows from investing activities:    
Purchases of marketable securities (12,617) (26,661)
Proceeds from sales of marketable securities 28,059 18,580
Proceeds from maturities of marketable securities 3,881 4,765
Cash acquired in acquisition, net of cash paid 197 0
Purchases of property, plant and equipment (513) (511)
Other (31) (119)
Net cash provided by (used in) investing activities 18,976 (3,946)
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 1,499
Repurchases of common stock (15,670) (2,371)
Dividends paid (2,667) (2,531)
Other (85) (137)
Net cash used in financing activities (18,922) (4,460)
Increase (decrease) in cash and cash equivalents 8,156 (241)
Cash and cash equivalents at beginning of period 3,800 3,241
Cash and cash equivalents at end of period $ 11,956 $ 3,000