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Summary of Significant Accounting Policies - Consolidated Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net income | $ 2,160 | $ 3,554 | $ 1,808
Pension and other postretirement remeasurement gains and losses | 468 | (217) | 270
Income taxes | (380) | (52) | 381
Other operating assets and liabilities | 855 | (13) | (181)
Net cash provided by operating activities | 5,175 | 4,314 | 3,993
Previously reported |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net income | 2,252 | 3,189 | 1,877
Pension and other postretirement remeasurement gains and losses | 0 | 0 | 0
Income taxes | (356) | (245) | 417
Other operating assets and liabilities | 1,207 | 328 | (16)
Net cash provided by operating activities | 5,175 | 4,314 | 3,993
Restatement Adjustment | Impact of change |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Net income | (92) | 365 | (69)
Pension and other postretirement remeasurement gains and losses | 468 | (217) | 270
Income taxes | (24) | 193 | (36)
Other operating assets and liabilities | (352) | (341) | (165)
Net cash provided by operating activities | $ 0 | $ 0 | $ 0

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