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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2011
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation [Table Text Block]
A reconciliation of the asset retirement obligations for 2011 follows:
 
(In millions)
Asset retirement obligations at January 1, 2011
$
1,514

Accretion
93

Liabilities incurred
10

Liabilities settled
(23
)
Revision in estimated cash flows
(1
)
Asset retirement obligations at December 31, 2011
1,593

Less amount included in current liabilities
(2
)
 
$
1,591