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Income Taxes - U.S. Tax Cuts and Jobs Act (Tax Act) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Line Items]      
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) $ (61)    
Deemed repatriation tax payable   $ 230 $ 261
Tax Act liabilities for deemed repatriation (Note 5)   204 $ 235
Other Noncurrent Liabilities      
Income Taxes [Line Items]      
Tax Act liabilities for deemed repatriation (Note 5) 235 $ 204  
United States      
Income Taxes [Line Items]      
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) (41)    
State and Local Jurisdiction      
Income Taxes [Line Items]      
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) $ (20)