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Income Taxes - Deferred Tax Assets and Valuation Allowance, Taxes Receivable and Payable (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Taxes receivable and payable    
Net deferred tax assets $ 1,900 $ 2,200
Tax Cut and Jobs Act of 2017, deferred tax asset valuation allowance adjustment, change in effective tax rate 1,800  
Valuation allowance 1,863 2,032
Net deferred tax assets 113 205
Foreign net operating loss carryforwards 66 63
Foreign capital loss carryforwards 1 $ 1
Current taxes payable 7  
Current taxes receivable 1  
Domestic Tax Authority    
Taxes receivable and payable    
Operating loss carryforwards 596  
State and Local Jurisdiction    
Taxes receivable and payable    
Valuation allowance 267  
Operating loss carryforwards 140  
Foreign Tax Authority    
Taxes receivable and payable    
Operating loss carryforwards 66  
Federal Tax Authority    
Taxes receivable and payable    
Valuation allowance $ 1,500