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Fair Value Measurements - Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash collateral netted with derivative liabilities |  | $ 15 | $ 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 | [1] | (161) | (323)
Commodity derivative instruments, assets - net carrying value on balance sheet | [2] | 24 | 78
Commodity derivative instruments, assets - collateral pledged not offset |  | 77 | 2
Commodity derivative instruments, liabilities - netting and collateral | [1] | (176) | (284)
Commodity derivative instruments, liabilities - net carrying value on balance sheet | [2] | 1 | 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] | 54 | 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 |  | 176 | 370
Commodity derivative instruments, liabilities - gross |  | 165 | 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 |  | 9 | 31
Commodity derivative instruments, liabilities - gross |  | 12 | 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 |  | $ 54 | $ 61
[1] | Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of September 30, 2019, cash collateral of $15 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.

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