Supplemental Cash Flow Information (Details) (USD $) In Millions	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Changes in Assets and Liabilities, Exclusive of Changes Shown Separately
Accounts receivable, net	$ 65	$ 260
Inventories	(23)	(34)
Accrued/prepaid pensions	(187)	(99)
Accounts payable	27	7
Income taxes payable	242	40
Derivative assets and liabilities	(20)	(62)
Gas inventory equalization	109	68
Postretirement obligation	(55)	17
Other assets	202	98
Other liabilities	(94)	(38)
Total Changes in Assets and Liabilities	266	257
Supplementary cash and non-cash information
Noncash financing activities: Common stock issued for employee benefit plans	$ 1	$ 136

Provision for differences between book cost and estimated replacement cost of gas withdrawn from underground storage inventory in the beginning of the year for which a plan exists to replace through injection by year's end.

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Supplementary cash and noncash information.

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The net change during the reporting period in the aggregate amount of obligations due within one year (or one business cycle). This may include trade payables, amounts due to related parties, royalties payable, and other obligations.

+ References

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The net change during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The net change during the period in the amount of cash payments due to taxing authorities for taxes that are based on the reporting entity's earnings.

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The net change during the reporting period in the assets (liabilities) created through trading commodity-based derivative instruments.

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The net change during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The net change during the reporting period of all current assets and liabilities used in operating activities.

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The net change during the reporting period in other operating assets not otherwise defined in the taxonomy.

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The net change during the reporting period in other operating obligations not otherwise defined in the taxonomy.

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The net change during the reporting period in the amount due to fund non-pension benefits provided to former, retired, and disabled employees.

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The net change in the beginning and end of period Prepaid Pension costs.

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The fair value of stock issued in noncash financing activities.

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