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Fair Value (Nonrecurring Measurements) (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset Retirement Obligation   $ 23,000,000
Other Nonoperating Expense $ 44,000,000 0
Asset Impairment Charges 50,000,000 0
Other Asset Impairment Charges 6,000,000 $ 0
Long Lived Assets Held And Used [Member] | OPGC [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Asset Impairment Charges 43,000,000  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | OPGC [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cumulative Translation Adjustment, Net of Tax, Period Increase (Decrease) 115,000,000  
Assets Carrying Amount Disclosure Nonrecurring [1] 195,000,000  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | OPGC [Member] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Carrying Amount Disclosure Nonrecurring 0  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | OPGC [Member] | Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Carrying Amount Disclosure Nonrecurring 0  
Long Lived Assets Held And Used [Member] | Fair Value [Member] | OPGC [Member] | Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Carrying Amount Disclosure Nonrecurring $ 152,000,000  
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Weighted Average [Member] | OPGC [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurement Inputs, Nonrecurring 2.00%  
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Maximum [Member] | OPGC [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurement Inputs, Nonrecurring 40.00%  
Measurement Input, Long-term Revenue Growth Rate [Member] | Valuation, Income Approach [Member] | Long Lived Assets Held And Used [Member] | Minimum [Member] | OPGC [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurement Inputs, Nonrecurring (25.00%)  
Measurement Input, Discount Rate [Member] | Long Lived Assets Held And Used [Member] | Valuation, Income Approach [Member] | Weighted Average [Member] | OPGC [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets Carrying Amount Disclosure Nonrecurring $ 0.12  
Interest Rate Contract [Member] | Measurement Input, Entity Credit Risk [Member] | Weighted Average [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurement Inputs, Nonrecurring 6.10%  
Interest Rate Contract [Member] | Measurement Input, Entity Credit Risk [Member] | Maximum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurement Inputs, Nonrecurring 6.30%  
Interest Rate Contract [Member] | Measurement Input, Entity Credit Risk [Member] | Minimum [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value Measurement Inputs, Nonrecurring 1.80%  
[1]
Represents the carrying value at the date of measurement, before fair value adjustment and excluding $115 million of cumulative translation adjustment balance.