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Compensation and Benefit Plans (Benefit Payments) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Mar. 01, 2012
Dec. 31, 2013
Pension Plans
Dec. 31, 2013
Pension Plans
Midwest Generation LLC [Member]
Dec. 31, 2012
Pension Plans
Midwest Generation LLC [Member]
Dec. 31, 2013
Pension Plans
Other EME Subsidiaries
Dec. 31, 2012
Pension Plans
Other EME Subsidiaries
Dec. 31, 2013
Postretirement Benefits Other Than Pensions
Dec. 31, 2013
Postretirement Benefits Other Than Pensions
Midwest Generation LLC [Member]
Dec. 31, 2013
Postretirement Benefits Other Than Pensions
Other EME Subsidiaries
Benefit payments expected to be paid, net:                    
2014, estimated future benefit payments     $ 15 $ 11   $ 4 [1]   $ 3 $ 2 $ 1
2015, estimated future benefit payments     16 12   4 [1]   3 2 1
2016, estimated future benefit payments     17 13   4 [1]   4 2 2
2017, estimated future benefit payments     18 14   4 [1]   4 2 2
2018, estimated future benefit payments     19 15   4 [1]   4 2 2
2019-2023, estimated future benefit payments     104 84   20 [1]   28 17 11
After tax value of post retirement benefits to be assumed by Edison International 3 25                
Curtailment adjustment     $ 0 [2] $ 0 $ 0 $ 0 [2] $ (9) [2]      
[1] Excludes Homer City.
[2] Includes Homer City.