Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

v3.20.4
Income Taxes - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]      
Federal $ 0 $ 0 $ 0
Effective income tax rate percent 69.50% 23.60% 17.20%
Tax credit $ 44,000,000 $ 33,000,000  
Valuation allowance 54,000,000 70,000,000  
Unrecognized tax benefits 433,000,000 406,000,000 $ 387,000,000
Unrecognized tax benefits that would impact effective tax rate 310,000,000    
Uncertain tax positions are recognized in other long-term liabilities 30,000,000 12,000,000  
Unrecognized tax benefits, increase resulting from interest 6,000,000 $ 2,000,000  
Domestic Plan      
Operating Loss Carryforwards [Line Items]      
Gross operating loss carryforwards $ 1,354,000,000