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Equity Equity - AOCI Reclassifications Table (Details) (Accumulated Other Comprehensive Income (Loss) [Member], USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ (1) $ (1) $ 5 $ 17
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax (1) (1) 10 11
Accumulated Net Unrealized Investment Gain (Loss) [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     (5) 6
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Impairment of Investment [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     0 6
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Sale of Investment [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     $ (5) $ 0