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Fair Value Measurements (Assets and Liabilities Accounted for at Fair Value on Recurring Basis) (Detail) - USD ($)
$ in Millions

Jun. 30, 2022

Dec. 31, 2021

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Cash collateral netted with derivative liabilities

$ 2

$ 14

Fair Value, Measurements, Recurring | Commodity derivatives

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Commodity derivative instruments, assets - netting and collateral

^[1]

(620)

(235)

Derivative asset, net carrying value on balance sheet

^[2]

141

36

Commodity derivative instruments, assets - collateral pledged not offset

79

34

Commodity derivative instruments, liabilities - netting and collateral

^[1]

(622)

(249)

Derivative liability, 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

Derivative liability, net carrying value on balance sheet

^[2]

92

108

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

761

270

Commodity derivative instruments, liabilities - gross

622

248

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

0

1

Commodity derivative instruments, liabilities - gross

0

1

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

$ 92

$ 108

[1]	Represents the impact of netting assets, liabilities and cash collateral when a legal right of offset exists. As of June 30, 2022, cash collateral of $2 million was netted with the mark-to-market derivative liabilities. As of December 31, 2021, cash collateral of $14 million was netted with mark-to-market derivative liabilities.
[2]	We have no derivative contracts that are covered by master netting arrangements reflected gross on the balance sheet.

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