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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 6,243 $ 5,787
Depreciation and amortization 1,506 1,546
Share-based compensation expense 244 222
Deferred income taxes (379) 80
Other items, net 381 93
Changes in operating assets and liabilities:    
Trade receivables, net (229) (192)
Inventories (54) (125)
Other assets (110) (335)
Accounts payable (50) (147)
Accrued income taxes, net 48 (140)
Other liabilities 565 465
Net cash provided by operating activities 8,165 7,254
Cash flows from investing activities:    
Purchases of property, plant and equipment (511) (511)
Purchases of marketable securities (26,661) (22,682)
Proceeds from sales of marketable securities 18,580 14,072
Proceeds from maturities of marketable securities 4,765 1,932
Other (119) (247)
Net cash used in investing activities (3,946) (7,436)
Cash flows from financing activities:    
Net proceeds from issuance of debt 3,485 6,713
Repayment of debt (4,405) (2,725)
Net change in commercial paper 1,499 0
Repurchases of common stock (2,371) (1,982)
Dividends paid (2,531) (2,251)
Other (137) (232)
Net cash used in financing activities (4,460) (477)
Decrease in cash and cash equivalents (241) (659)
Cash and cash equivalents at beginning of period 3,241 4,144
Cash and cash equivalents at end of period $ 3,000 $ 3,485