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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2013
Supplemental Cash Flow Elements [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]
A detailed analysis of the changes in assets and liabilities that are reported in the Consolidated Statements of Cash Flows follows:
 
Six Months Ended June 30,
 
2013
 
2012
 
(In millions)
Changes in Assets and Liabilities, Exclusive of Changes Shown Separately
 
 
 
Accounts receivable, net
$
70

 
$
120

Inventories
133

 
81

Accrued/prepaid pensions
(42
)
 
6

Accounts payable
(29
)
 
(4
)
Income taxes payable/receivable
(20
)
 
(39
)
Derivative assets and liabilities
(15
)
 
26

Postretirement obligation
(174
)
 
(142
)
Gas inventory equalization
73

 
65

Other assets
324

 
299

Other liabilities
(45
)
 
(112
)
 
$
275

 
$
300
Schedule of Other Significant Noncash Transactions [Table Text Block]
Supplementary non-cash information is as follows:
 
Six Months Ended June 30,
 
2013
 
2012
 
(In millions)
Common stock issued for employee benefit and compensation plans
$
165

 
$
129

Change in capital expenditures not paid
$
(17
)
 
$
(55
)