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Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Tax provision at the parent statutory rate $ (96) $ 222 $ 278
Foreign income taxed at different rates (6) 79 102
Change in valuation allowance (9) (502) 31
Italian IRAP taxes 12 14 21
Tax contingencies 5 7 29
Tax credits and incentives (36) (88) (66)
Goodwill impairment 111 0 0
Nikola fair value remeasurement effect (24) 0 0
Change in tax rate or law (14) (5) (8)
Withholding taxes 0 2 7
Other 7 0 23
Total income tax provision (benefit) $ (50) $ (271) $ 417