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Derivative Instruments and Hedging Activities (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
CounterParty
Derivative Instruments and Hedging Activities (Textual) [Abstract]  
Number of counterparties 18
Realization of gains and losses on hedges in future earnings mid 2014
Net gain included in accumulated other comprehensive income (loss), before tax applied to next twelve months $ 181
Net gain included in accumulated other comprehensive income (loss), after tax $ 138
2012 [Member]
 
Derivative [Line Items]  
Percentage of collars derivative settled in two thousand and twelve 28.00%
2013 [Member]
 
Derivative [Line Items]  
Percentage of collars derivative settled in two thousand and thirteen 44.00%