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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets |  |
Employee benefits | $ 208 | $ 238
Accrued expenses | 86 | 76
Net operating loss, capital loss and tax credit carryforwards | 1,519 | 1,526
Derivative instruments and interest rate and currency swaps | 15 | 9
Debt fair value adjustment | 29 | 33
Investments | 0 | 177
Valuation allowances | (155) | (178)
Total deferred tax assets | 1,702 | 1,881
Deferred tax liabilities |  |
Property, plant and equipment | 385 | 270
Investments | 418 | 0
Other | 42 | 45
Total deferred tax liabilities | 845 | 315
Net deferred tax assets | $ 857 | $ 1,566

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