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Income Taxes Income Tax Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Benefit |  | $ 94 |  | $ 39
Tax Cuts and Jobs Act of 2017, Indirect Impact on Inventory, Income Tax Expense |  |  |  | 16
Tax benefit (charge) related to application of the Act's foreign tax provisions | $ 13 |  | $ (83) |
Tax charge related to U.S. state blended tax rate changes associated with the Business Separations |  |  | 146 |
Tax benefit related to an internal legal entity restructuring associated with the Intended Business Separations |  |  | 102 |
Pension Resize [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Benefit |  | 114 |  |
Swiss Tax Reform [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Other Tax (Benefit) Expense | $ (38) |  | (38) |
Change in accruals [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Other Tax (Benefit) Expense |  |  | $ (21) |
Brazil Valuation Allowance [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Other Tax (Benefit) Expense |  | 75 |  | 75
Repatriation Accrual [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Other Tax (Benefit) Expense |  | 61 |  | 61
2018 DMD [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Other Tax (Benefit) Expense |  | 27 |  | 27
Internal Entity Restructuring [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Other Tax (Benefit) Expense |  | $ 26 |  | $ 26

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