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Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2011
Asset Retirement Obligation Disclosure [Abstract] 
Schedule of Change in Asset Retirement Obligation [Table Text Block]
A reconciliation of the asset retirement obligations for the nine months ended September 30, 2011 follows:
(in Millions)
 
Asset retirement obligations at December 31, 2010
$
1,514

Accretion
69

Liabilities incurred
3

Revision in estimated cash flows
(1
)
Liabilities settled
(15
)
Asset retirement obligations at September 30, 2011
1,570

Less amount included in current liabilities
(10
)
 
$
1,560