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INCOME TAXES - Deferred Tax Assets Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Valuation Allowance [Line Items]    
Valuation allowance $ 9,387 $ 0
Foreign Tax Credit Carryforwards    
Valuation Allowance [Line Items]    
Valuation allowance 5,700  
U.S. Residual Deferred Tax Asset Related to Non-U.S. Branches    
Valuation Allowance [Line Items]    
Valuation allowance 2,200  
Local Non-U.S. Deferred Tax Assets    
Valuation Allowance [Line Items]    
Valuation allowance 1,400  
State Net Operating Loss Carryforwards    
Valuation Allowance [Line Items]    
Valuation allowance $ 100