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Fair Value Measurements (Assets and Liabilities Accounted for at Fair Value on Recurring Basis) (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash collateral netted with derivative liabilities $ 98 $ 51
Fair Value, Measurements, Recurring | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - netting and collateral [1] (260) (55)
Commodity derivative instruments, assets - net carrying value on balance sheet [2] 3 8
Commodity derivative instruments, assets - collateral pledged not offset 46 73
Commodity derivative instruments, liabilities - netting and collateral [1] (358) (106)
Commodity derivative instruments, liabilities - net carrying value on balance sheet [2] 0 0
Commodity derivative instruments, liabilities - collateral pledged not offset 0 0
Fair Value, Measurements, Recurring | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - netting and collateral 0 0
Commodity derivative instruments, liabilities - net carrying value on balance sheet [2] 51 60
Commodity derivative instruments, liabilities - collateral pledged not offset 0 0
Fair Value, Measurements, Recurring | Level 1 | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 255 57
Commodity derivative instruments, liabilities - gross 350 95
Fair Value, Measurements, Recurring | Level 1 | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Measurements, Recurring | Level 2 | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 8 6
Commodity derivative instruments, liabilities - gross 8 11
Fair Value, Measurements, Recurring | Level 2 | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Measurements, Recurring | Level 3 | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 0 0
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Measurements, Recurring | Level 3 | Embedded derivatives in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross $ 51 $ 60
[1]
Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of June 30, 2020, cash collateral of $98 million was netted with the mark-to-market derivative liabilities. As of December 31, 2019, cash collateral of $51 million was netted with mark-to-market derivative liabilities.
[2]
We have no derivative contracts that are subject to master netting arrangements reflected gross on the balance sheet.