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Income Taxes Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended | 16 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2020
Operating Loss Carryforwards [Line Items] |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense | $ 182 | $ 928 |
Tax Cuts and Jobs Act of 2017, Indirect Impact on Inventory, Income Tax Expense | 16 |  |
Undistributed Earnings of Foreign Subsidiaries |  |  | $ 4,130
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit) | (34) | $ (2,847) |
Pension Resize [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax Cuts and Jobs Act, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense (Benefit) | $ (114) |  |

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