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Income Taxes - Narrative (Details) - USD ($) $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 22, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Deferred tax benefit relating to tax cuts and jobs act | $ 764 |  |  | $ 764 |
Effective tax rate without TCJA |  |  |  | 29.00% |
Effective tax rate |  | 21.00% | 20.00% | (1.00%) |
Valuation allowance |  | $ 119 | $ 119 | $ 126 | $ 122
Undistributed earnings |  | 5,200 |  |  |
Deferred tax benefit related to impact of TCJA |  |  |  | 764 |
Unrecognized tax benefits that would impact effective tax rate |  | 85 | 81 |  |
Increases in unrecognized tax benefits |  | 17 |  |  |
Decrease in unrecognized tax benefits |  | 13 |  |  |
Unrecognized tax benefits |  | 103 | 98 | 115 | $ 112
Income tax expense (benefit) for interest and penalties |  | 5 | (6) | $ (1) |
Unrecognized tax benefits, income tax penalties and interest accrued |  | 33 | 28 |  |
Domestic Tax Authority |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  | 119 | 133 |  |
State and Local Jurisdiction |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  | 110 | 201 |  |
Foreign Tax Authority |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  | 282 | $ 285 |  |
Other Noncurrent Liabilities |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Unrecognized tax benefits |  | 90 |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued |  | 23 |  |  |
Other Current Liabilities |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Unrecognized tax benefits |  | 13 |  |  |
Unrecognized tax benefits, income tax penalties and interest accrued |  | $ 10 |  |  |

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