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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]            
Tax at United States statutory rate       21.00% 21.00% 21.00%
State income taxes, net of federal benefit       1.00% 0.60% 1.00%
Earnings taxed at other than United States statutory rate       3.30% 4.60% 5.60%
Charge for U.S. tax reform       0 0 0.023
Foreign Tax Credit Carryback       0.00% 0.00% (1.70%)
(Benefit) charge for previously disclosed tax matters       (2.00%) (0.90%) (0.40%)
Foreign-derived intangible income benefit       (1.60%) (1.30%) (1.10%)
Other, net       (0.10%) (0.60%) (0.50%)
Effective tax rate       21.60% 23.40% 26.20%
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent       100.00%    
Tax reform, provisional charge   $ 14,000,000 $ 275,000,000 $ 0 $ 0 $ 80,000,000
Discrete Income Tax Provision (Benefit)       71,000,000    
Foreign Withholding Income Tax       45,000,000    
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount       26,000,000    
Withholding Tax Due       $ 0    
Income tax benefit related to changes in swiss preferential tax regime and increase to cantonal tax rate $ 29,000,000          
SWITZERLAND            
Restructuring Cost and Reserve [Line Items]            
Benefit from foreign tax matter $ 29,000,000       $ 29,000,000 $ 15,000,000