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Summary of Significant Accounting Policies - Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net income | $ 4,847 | $ 2,160 | $ 3,554
Pension and other postretirement measurement gains and losses | 114 | 468 | (217)
Income taxes | 487 | (380) | (52)
Other operating assets and liabilities | 50 | (855) | 13
Net cash provided by operating activities | 5,129 | 5,175 | 4,314
Previously reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net income | 4,811 | 2,252 | 3,189
Pension and other postretirement measurement gains and losses | 0 | 0 | 0
Income taxes | 477 | (356) | (245)
Other operating assets and liabilities | (110) | (1,207) | (328)
Net cash provided by operating activities | 5,129 | 5,175 | 4,314
Impact of change | Impact of change |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net income | 36 | (92) | 365
Pension and other postretirement measurement gains and losses | 114 | 468 | (217)
Income taxes | 10 | (24) | 193
Other operating assets and liabilities | 160 | 352 | 341
Net cash provided by operating activities | $ 0 | $ 0 | $ 0

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