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Significant Accounting Policies - Consolidated Statement of Cash Flow as Adjusted (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Cash Flows from Operating Activities |  |  |  |
Net income including noncontrolling interest | $ 1,525 | $ 1,303 | $ 3,152 | $ 2,613
Company pension and postretirement expense |  |  | 92 | 155
Other - net |  |  | $ (80) | (376)
Under Prior Method |  |  |  |
Cash Flows from Operating Activities |  |  |  |
Net income including noncontrolling interest |  | $ 1,287 |  | 2,581
Company pension and postretirement expense |  |  |  | 197
Other - net |  |  |  | $ (386)

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