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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2011
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
Gain (Loss)
on Cash
Flow Hedges
 
Pension and
PBOP – Net
Loss
 
Pension and
PBOP – Prior
Service Cost
 
Accumulated
Other
Comprehensive
Loss
Balance at December 31, 2009
$
105

 
$
(70
)
 
$
2

 
$
37

Change for 2010
(89
)
 
(17
)
 
(7
)
 
(113
)
Balance at December 31, 2010
16

 
(87
)
 
(5
)
 
(76
)
Change for 2011
(50
)
 
(13
)
 
—

 
(63
)
Balance at December 31, 2011
$
(34
)
 
$
(100
)
 
$
(5
)
 
$
(139
)