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Significant Accounting Policies - Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net income including noncontrolling interest | $ 5,929 | $ 5,453 | $ 4,529
Company pension and postretirement expense | 206 | 322 | 426
Other — net | $ 227 | 417 | (127)
Under Prior Method |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net income including noncontrolling interest |  | 5,388 | 4,582
Company pension and postretirement expense |  | 406 | 357
Other — net |  | $ 398 | $ (111)

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