| CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended | |
| | Dec. 31, 2020 | Dec. 31, 2019 |
| OPERATING ACTIVITIES | | |
| CONSOLIDATED NET INCOME | $ 7 768 | $ 8 985 |
| Depreciation and amortization | 1 536 | 1 365 |
| Stock-based compensation expense | 126 | 201 |
| Deferred income taxes | -18 | -280 |
| Equity (income) loss - net of dividends | -511 | -421 |
| Foreign currency adjustments | -88 | 91 |
| Significant (gains) losses on sales of assets - net | -914 | -467 |
| Other operating charges | 556 | 127 |
| Other items | 699 | 504 |
| Net change in operating assets and liabilities | 690 | 366 |
| Net cash provided by operating activities | 9 844 | 10 471 |
| INVESTING ACTIVITIES | | |
| Purchases of investments | -13,583 | -4,704 |
| Proceeds from disposals of investments | 13 835 | 6 973 |
| Acquisitions of businesses, equity method investments and nonmarketable securities | -1,052 | -5,542 |
| Proceeds from disposals of businesses, equity method investments and nonmarkatable securities | 189 | 429 |
| Purchases of property, plant and equipment | -1,177 | -2,054 |
| Proceeds from disposals of property, plant and equipment | 189 | 978 |
| Other investing activities | 122 | -56 |
| Net cash provided by (used in) investing activities | -1,477 | -3,976 |
| FINANCING ACTIVITIES | | |
| Issuances of debt | 26 934 | 23 009 |
| Payments of debt | -28,796 | -24,850 |
| Issuances of stock | 647 | 1 012 |
| Purchases of stock for treasury | -118 | -1,103 |
| Dividends | -7,047 | -6,845 |
| Other financing activities | 310 | -227 |
| Net cash provided by (used in) financing activities | -8,070 | -9,004 |
| EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS | 76 | -72 |
| CASH AND CASH EQUIVALENTS | | |
| Net increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents during the year | 373 | -2,581 |
| Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents at the Beginning of the Year | 6 737 | 9 318 |
| Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents at the End of the Year | 7 110 | 6 737 |
| Restricted Cash and Restricted Cash Equivalents not included in Cash and Cash Equivalents on Balance Sheet | 315 | 257 |
| Cash and cash equivalents | $ 6 795 | $ 6 480 |
