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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 8,394 $ 1,979 $ 7,722
Depreciation and amortization 1,946 1,955 2,105
Stock-based compensation expense 311 329 311
Deferred income taxes (363) (1,330) 183
Other items, net 386 334 32
Changes in operating assets and liabilities, net of acquisitions:      
Trade receivables, net (378) (58) (214)
Inventories (3) 133 (80)
Other assets 35 (24) (128)
Accounts payable (143) 424 (44)
Accrued income taxes, net (361) 523 (301)
Long-term tax liabilities 258 6,681 445
Other liabilities 1,214 231 323
Net cash provided by operating activities 11,296 11,177 10,354
Cash flows from investing activities:      
Purchases of marketable securities (18,741) (33,607) (28,094)
Proceeds from sales of marketable securities 28,356 24,240 17,958
Proceeds from maturities of marketable securities 5,412 6,174 2,459
Purchases of property, plant and equipment (738) (664) (738)
Cash acquired in acquisition, net of cash paid 195 (19) 0
Other (145) (148) (243)
Net cash provided by (used in) investing activities 14,339 (4,024) (8,658)
Cash flows from financing activities:      
Net proceeds from issuance of debt 0 4,476 7,318
Repayment of debt (1,121) (4,405) (3,725)
Repurchases of common stock (17,794) (3,160) (2,965)
Dividends paid (3,507) (3,365) (2,998)
Withholding taxes arising from shares withheld for share-based payments (126) (191) (260)
Other 58 51 31
Net cash used in financing activities (22,490) (6,594) (2,599)
Increase (decrease) in cash and cash equivalents 3,145 559 (903)
Cash and cash equivalents at beginning of year 3,800 3,241 4,144
Cash and cash equivalents at end of year $ 6,945 $ 3,800 $ 3,241