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Accounting for Derivative Instruments and Hedging Activities (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Derivatives Designated as Cash Flow Hedges
Dec. 31, 2013
Derivatives Designated as Cash Flow Hedges
Mar. 31, 2014
Derivatives Not Designated as Cash Flow Hedges
Dec. 31, 2013
Derivatives Not Designated as Cash Flow Hedges
Mar. 31, 2014
Interest rate contracts
Dec. 31, 2013
Interest rate contracts
Mar. 31, 2014
Interest rate contracts current
Derivatives Designated as Cash Flow Hedges
Dec. 31, 2013
Interest rate contracts current
Derivatives Designated as Cash Flow Hedges
Mar. 31, 2014
Interest rate contracts current
Derivatives Not Designated as Cash Flow Hedges
Dec. 31, 2013
Interest rate contracts current
Derivatives Not Designated as Cash Flow Hedges
Mar. 31, 2014
Interest rate contracts long-term
Derivatives Designated as Cash Flow Hedges
Dec. 31, 2013
Interest rate contracts long-term
Derivatives Designated as Cash Flow Hedges
Mar. 31, 2014
Interest rate contracts long-term
Derivatives Not Designated as Cash Flow Hedges
Dec. 31, 2013
Interest rate contracts long-term
Derivatives Not Designated as Cash Flow Hedges
Mar. 31, 2014
Commodity contracts current
Derivatives Designated as Cash Flow Hedges
Dec. 31, 2013
Commodity contracts current
Derivatives Designated as Cash Flow Hedges
Mar. 31, 2014
Commodity contracts current
Derivatives Not Designated as Cash Flow Hedges
Dec. 31, 2013
Commodity contracts current
Derivatives Not Designated as Cash Flow Hedges
Mar. 31, 2014
Commodity contracts long-term
Derivatives Designated as Cash Flow Hedges
Dec. 31, 2013
Commodity contracts long-term
Derivatives Designated as Cash Flow Hedges
Mar. 31, 2014
Commodity contracts long-term
Derivatives Not Designated as Cash Flow Hedges
Dec. 31, 2013
Commodity contracts long-term
Derivatives Not Designated as Cash Flow Hedges
Mar. 31, 2014
Short Ton
Emissions
T
Dec. 31, 2013
Short Ton
Emissions
T
Mar. 31, 2014
Short Ton
Coal
T
Dec. 31, 2013
Short Ton
Coal
T
Mar. 31, 2014
MMbtu
Natural Gas
Dec. 31, 2013
MMbtu
Natural Gas
Mar. 31, 2014
Barrel
Oil
bbl
Dec. 31, 2013
Barrel
Oil
bbl
Mar. 31, 2014
MWh
Power
Dec. 31, 2013
MWh
Power
Mar. 31, 2014
Dollars
Interest
Dec. 31, 2013
Dollars
Interest
Mar. 31, 2014
CVSR
Interest rate contracts
Mar. 31, 2013
Alpine
Interest rate contracts
Derivative                                                                            
Loss previously deferred in OCI recognized in earnings resulting from discontinued cash flow hedge accounting                                                                              
Volumetric Underlying Derivative Transactions                                                                            
Derivative, Nonmonetary Notional Amount, Volume                                                             1,000,000 1,000,000            
Derivative, Nonmonetary Notional Amount, Energy Measure                                                         111,000,000 (166,000,000)     35,000,000 (27,000,000)        
Derivative, Nonmonetary Notional Amount, Mass                                                 2,000,000 0 50,000,000 51,000,000                    
Derivative, Notional Amount                                                                     1,439 1,444    
Fair Value of Derivative Instrument                                                                            
Derivative Assets 1,906 1,639 8 14 1,898 1,625 12 20 0 0 0 0 8 14 4 6 0 0 1,573 1,328 0 0 321 291                            
Derivative Liabilities $ 1,761 $ 1,250 $ 63 $ 66 $ 1,698 $ 1,184 $ 70 $ 69 $ 32 $ 35 $ 5 $ 4 $ 31 $ 29 $ 2 $ 1 $ 0 $ 1 $ 1,467 $ 1,015 $ 0 $ 1 $ 224 $ 164