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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income $ 4,171 $ 4,607
Depreciation, amortization and other 996 955
Deferred income taxes (70) (114)
Other items, net 32 181
Changes in operating assets and liabilities, net of acquisition:    
Trade receivables, net (228) (348)
Inventories (118) (135)
Other assets (158) (232)
Accounts payable (205) (329)
Accrued income taxes, net (257) (314)
Long-term tax liabilities (322) 134
Other liabilities (582) 424
Net cash provided by operating activities 3,259 4,829
Cash flows from investing activities:    
Purchases of marketable securities (7,250) (6,733)
Proceeds from sales of marketable securities 217 23,723
Proceeds from maturities of marketable securities 13,617 993
Cash acquired in acquisition, net of cash paid 0 197
Purchases of property, plant and equipment (260) (342)
Other (24) 6
Net cash provided by investing activities 6,300 17,844
Cash flows from financing activities:    
Repayment of debt (3,650) (500)
Repurchases of common stock (5,447) (13,941)
Dividends paid (1,781) (1,816)
Other (101) (85)
Net cash used in financing activities (10,979) (16,342)
(Decrease) increase in cash and cash equivalents (1,420) 6,331
Cash and cash equivalents at beginning of period 6,945 3,800
Cash and cash equivalents at end of period $ 5,525 $ 10,131