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Fair Value Measurements - Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash collateral netted with derivative liabilities $ 33 $ 13
Cash collateral netted with derivatives assets   52
Fair Value, Measurements, Recurring | Commodity derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - netting and collateral (128) [1] (323)
Commodity derivative instruments, assets - net carrying value on balance sheet [2] 12 78
Commodity derivative instruments, assets - collateral pledged not offset 42 2
Commodity derivative instruments, liabilities - netting and collateral (161) [1] (284)
Commodity derivative instruments, liabilities - net carrying value on balance sheet [2] 5 8
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] 65 61
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 122 370
Commodity derivative instruments, liabilities - gross 142 255
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 18 31
Commodity derivative instruments, liabilities - gross 24 37
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 $ 65 $ 61
[1] Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of March 31, 2019, cash collateral of $33 million was netted with the mark-to-market derivative liabilities. As of December 31, 2018, cash collateral of $52 million was netted with mark-to-market derivative assets and $13 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.