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Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Liabilities: |  |
Differences between book and tax basis of property | $ (1,308) | $ (1,426)
Deferred Tax Liabilities, Investment in US Tax Partnerships | (332) | (44)
Deferred income taxes | 1,100 | 1,213
Other taxable temporary differences | (403) | (287)
Deferred Tax Liabilities, Gross | (2,043) | (1,757)
Deferred Tax Assets: |  |
Operating loss carryforwards | 1,156 | 1,060
Capital loss carryforwards | 73 | 57
Bad debt and other book provisions | 87 | 74
Tax credit carryforwards | 78 | 33
Other deductible temporary differences | 471 | 300
Total gross deferred tax asset | 1,865 | 1,524
Less: Valuation allowance | (634) | (824)
Total net deferred tax asset | 1,231 | 700
Total deferred tax liability | $ (812) | $ (1,057)

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