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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective tax rate (as a percent) | 7.00% | 12.00% |  | 7.00% | 3.00% |
Tax benefit from Disposal of Canadian Holdings |  |  |  |  | $ 47 |
Removal of deferred tax liabilities |  |  |  | $ 35 | (23) | [1]
INCOME TAX EXPENSE (BENEFIT) | $ (18) | $ 15 | [2] | (35) | 13 | [2]
Taxes attributable to the noncontrolling interests | $ 38 |  |  | $ 80 |  |
Tax Cuts and Jobs Act of 2017, income tax expense (benefit) |  |  |  |  | 20 |
Accounting Standards Update 2017-05 [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income (loss) attributable to noncontrolling interest, before tax |  |  |  |  | 231 |
Canada Revenue Agency [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Removal of deferred tax liabilities |  |  |  |  | 69 |
Domestic Tax Authority [Member] |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
INCOME TAX EXPENSE (BENEFIT) |  |  |  |  | $ 22 |
[1] | Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.
[2] | Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.

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