Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 1,646	$ 1,825
Depreciation, amortization and other	841	897
Deferred income taxes	(91)	(84)
Other items, net	79	107
Changes in operating assets and liabilities, net of acquisition:
Trade receivables, net	91	(955)
Inventories	(126)	(113)
Other assets	(146)	319
Accounts payable	(29)	(25)
Accrued income taxes, net	52	137
Long-term tax liabilities	69	74
Other liabilities	(282)	(48)
Net cash provided by operating activities	2,104	2,134
Cash flows from investing activities:
Purchases of marketable securities	(7,597)	(129)
Proceeds from sales of marketable securities	3,999	2,574
Proceeds from maturities of marketable securities	3,524	113
Purchases of property, plant and equipment	(166)	(142)
Purchases of equity method investments	0	(2,645)
Other	(79)	(1)
Net cash used in investing activities	(319)	(230)
Cash flows from financing activities:
Proceeds from Issuance of Long-term Debt	0	4,963
Repayment of debt	0	(3,250)
Repurchases of common stock	(871)	(961)
Dividends paid	(1,016)	(945)
Other	(52)	(61)
Net cash used in financing activities	(1,939)	(254)
(Decrease) increase in cash and cash equivalents	(154)	1,650
Cash and cash equivalents at beginning of period	6,266	6,037
Cash and cash equivalents at end of period	$ 6,112	$ 7,687