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Income Taxes - Summary of Tax Credit Carryforwards (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Tax Credit Carryforward [Line Items]  
Tax Effected $ 613
U.S. tax losses  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 73
Tax Effected 15
Foreign tax credits  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 0
Tax Effected 334
General business credits  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 0
Tax Effected 51
State tax losses  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 0
Tax Effected 35
State tax credits  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 0
Tax Effected 32
Japan tax losses  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 102
Tax Effected 32
Germany tax losses  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 26
Tax Effected 8
United Kingdom tax losses  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 81
Tax Effected 14
Singapore tax losses  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 33
Tax Effected 6
Canada Tax Losses [Member]  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 46
Tax Effected 12
Other subsidiaries tax losses  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 128
Tax Effected 36
Spain tax credits  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 0
Tax Effected 25
Other subsidiaries tax credits  
Tax Credit Carryforward [Line Items]  
Gross Tax Loss 0
Tax Effected $ 13