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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash flows from operating activities:      
Net income $ 7,264 $ 7,842 $ 8,394
Depreciation, amortization and other 3,601 2,206 1,946
Stock-based compensation expense 330 308 311
Deferred income taxes (287) (289) (363)
Other items, net (195) (186) 386
Changes in operating assets and liabilities, net of acquisitions:      
Trade receivables, net (427) (504) (378)
Inventories (215) (66) (3)
Other assets 129 10 35
Accounts payable 45 164 (143)
Accrued income taxes, net (249) (585) (361)
Long-term tax liabilities (482) (146) 258
Other liabilities 983 396 1,214
Net cash provided by operating activities 10,497 9,150 11,296
Cash flows from investing activities:      
Purchases of marketable securities (8,477) (9,394) (18,741)
Proceeds from sales of marketable securities 2,597 8,842 28,356
Proceeds from maturities of marketable securities 4,381 20,548 5,412
Purchases of property, plant and equipment (608) (618) (738)
Cash paid for acquisitions, net of cash acquired 0 (13,617) 195
Payments to Acquire Equity Method Investments (3,219) (24) (40)
Other (75) (28) (105)
Net cash (used in) provided by investing activities (5,401) 5,709 14,339
Cash flows from financing activities:      
Net proceeds from issuance of debt 8,914 0 0
Repayment of debt (6,450) (4,514) (1,121)
Repurchases of common stock (3,486) (7,702) (17,794)
Dividends paid (3,755) (3,509) (3,507)
Other (90) (42) (68)
Net cash used in financing activities (4,867) (15,767) (22,490)
Increase (decrease) in cash and cash equivalents 229 (908) 3,145
Cash and cash equivalents at beginning of year 6,037 6,945 3,800
Cash and cash equivalents at end of year $ 6,266 $ 6,037 $ 6,945