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Significant Accounting Policies - Consolidated Statement of Cash Flow as Adjusted (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Cash Flows from Operating Activities |  |  |  |
Net income including noncontrolling interest | $ 1,437 | $ 1,434 | $ 4,589 | $ 4,047
Company pension and postretirement expense |  |  | 137 | 232
Other — net |  |  | $ 212 | 4
Under Prior Method |  |  |  |
Cash Flows from Operating Activities |  |  |  |
Net income including noncontrolling interest |  | $ 1,417 |  | 3,998
Company pension and postretirement expense |  |  |  | 295
Other — net |  |  |  | $ (10)

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