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Fair Value Measurements (Assets And Liabilities Accounted For At Fair Value On Recurring Basis) (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash collateral netted with derivative assets $ 52  
Cash collateral netted with derivative liabilities 13 $ 8
Fair Value, Measurements, Recurring    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - collateral and netting (323) (118)
Commodity derivative instruments, assets - collateral pledged not offset 2 8
Other assets   3
Total assets at fair value 78 12
Commodity derivative instruments, liabilities - netting and collateral (284) (126)
Commodity derivative instruments, liabilities - collateral pledged not offset 0 0
Total liabilities at fair value 69 66
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets   3
Total assets at fair value 370 130
Total liabilities at fair value 255 126
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets   0
Total assets at fair value 31 0
Total liabilities at fair value 37 0
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Other assets   0
Total assets at fair value 0 0
Total liabilities at fair value 61 66
Fair Value, Measurements, Recurring | Commodity derivative instruments    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - collateral and netting [1] (323) (118)
Commodity derivative instruments, assets - net [2] 78 9
Commodity derivative instruments, assets - collateral pledged not offset 2 8
Commodity derivative instruments, liabilities - netting and collateral [1] (284) (126)
Commodity derivative instruments, liabilities, net [2] 8 2
Commodity derivative instruments, liabilities - collateral pledged not offset 0 0
Fair Value, Measurements, Recurring | Commodity derivative instruments | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 370 127
Commodity derivative instruments, liabilities - gross 255 126
Fair Value, Measurements, Recurring | Commodity derivative instruments | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 31 0
Commodity derivative instruments, liabilities - gross 37 0
Fair Value, Measurements, Recurring | Commodity derivative instruments | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, assets - gross 0 0
Commodity derivative instruments, liabilities - gross 0 2
Fair Value, Measurements, Recurring | Embedded derivative in commodity contracts    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - netting and collateral [1] 0 0
Commodity derivative instruments, liabilities, net [2] 61 64
Commodity derivative instruments, liabilities - collateral pledged not offset 0 0
Fair Value, Measurements, Recurring | Embedded derivative in commodity contracts | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Measurements, Recurring | Embedded derivative in commodity contracts | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross 0 0
Fair Value, Measurements, Recurring | Embedded derivative in commodity contracts | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Commodity derivative instruments, liabilities - gross $ 61 $ 64
[1] Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. 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 liabilities. As of December 31, 2017, cash collateral of $8 million was netted with mark-to-market derivative liabilities.
[2] We have no derivative contracts which are subject to master netting arrangements reflected gross on the balance sheet.