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Derivative Instruments Summary of Derivative Activity (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Derivatives, Fair Value [Line Items]          
Derivative Assets Fair Value $ 0   $ 0   $ 0
Derivative Liabilities Fair Value 949   949   925
Gain (loss) on derivative instruments not designated as hedging instruments (84) $ (62) (25) $ (216)  
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 24   24   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] 1   1   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] 6   6   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 [2] 918   918   $ 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 $ (84) $ (62) $ (25) $ (216)  
[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. (2)Derivative component of the ZENS obligation that represents the ZENS holder’s option to receive the appreciated value of the reference shares at maturity. See Note 11 for further information.
[2] Derivative component of the ZENS obligation that represents the ZENS holder’s option to receive the appreciated value of the reference shares at maturity. See Note 11 for further information.