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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]  
Components of Accumulated Other Comprehensive Loss
Edison International's accumulated other comprehensive loss consists of:
(in millions)
Unrealized
Loss
on Cash
Flow Hedges
 
Pension and
PBOP – Net
Gain (Loss)
 
Pension and
PBOP – Prior
Service Cost
 
Accumulated
Other
Comprehensive
Loss
Balance at December 31, 2011
$
(34
)
 
$
(100
)
 
$
(5
)
 
$
(139
)
Change for 2012
(38
)
 
9

 
—

 
(29
)
Balance at September 30, 2012
$
(72
)
 
$
(91
)
 
$
(5
)
 
$
(168
)