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Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Deferred Tax Liabilities:    
Differences between book and tax basis of property $ (1,426) $ (1,418)
Other taxable temporary differences (287) (243)
Deferred Tax Liabilities, Gross (1,713) (1,661)
Deferred Tax Assets:    
Operating loss carryforwards 1,060 1,066
Capital loss carryforwards 57 52
Bad debt and other book provisions 74 62
Tax credit carryforwards 33 55
Other deductible temporary differences 256 111
Total gross deferred tax asset 1,480 1,346
Less: valuation allowance (824) (868)
Total net deferred tax asset 656 478
Total deferred tax liability $ (1,057) $ (1,183)