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Derivative Instruments Summary of Derivative Activity (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Derivatives, Fair Value [Line Items]          
Derivative Assets Fair Value $ 0   $ 0   $ 0
Derivative Liabilities Fair Value 879   879   925
Gain (loss) on derivative instruments not designated as hedging instruments (76) $ (68) 59 $ (154)  
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]          
Derivatives, Fair Value [Line Items]          
Derivative Assets Fair Value 0   0   0
Derivative Liabilities Fair Value 27   27   10
Energy Related Derivative [Member] | Not Designated as Hedging Instrument [Member] | Current Liabilities [Member]          
Derivatives, Fair Value [Line Items]          
Derivative Assets Fair Value 0   0   0 [1]
Derivative Liabilities Fair Value [1] 7   7   7
Energy Related Derivative [Member] | Not Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member]          
Derivatives, Fair Value [Line Items]          
Derivative Assets Fair Value 0   0   0 [1]
Derivative Liabilities Fair Value [1] 11   11   15
IDS Derivative [Member] | Not Designated as Hedging Instrument [Member] | Current Liabilities [Member]          
Derivatives, Fair Value [Line Items]          
Derivative Assets Fair Value 0   0   0
Derivative Liabilities Fair Value 834   834   $ 893
Gains (Losses) in Other Income (Expense) [Member] | IDS Derivative [Member]          
Derivatives, Fair Value [Line Items]          
Gain (loss) on derivative instruments not designated as hedging instruments $ (76) $ (68) $ 59 $ (154)  
[1]
Natural gas contracts are subject to master netting arrangements. This netting applies to all undisputed amounts due or past due. However, the mark-to-market fair value of each natural gas contract is in a liability position with no offsetting amounts.