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Fair Value Measurements Other Segments Fair Value (Details) (Other Segments and Holding Company [Member], Recurring measurement [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Level 1 [Member]
    
Assets [Abstract]    
Marketable equity and debt securities $ 5 $ 1
Trading securities 0 0
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 5 1
Liabilities [Abstract]    
Other liabilities 0 0
Derivative contracts at fair value (liability) 0 [2] 0 [2]
Fair value of derivative and other liabilities 0 0
Level 2 [Member]
    
Assets [Abstract]    
Marketable equity and debt securities 0 0
Trading securities 0 0
Derivative contracts, at fair value (asset) 72 [1] 1 [1]
Fair value of investment and derivative assets 72 1
Liabilities [Abstract]    
Other liabilities 29 16
Derivative contracts at fair value (liability) 25 [2] 35 [2]
Fair value of derivative and other liabilities 54 51
Level 3 [Member]
    
Assets [Abstract]    
Marketable equity and debt securities 0 0
Trading securities 102 116
Derivative contracts, at fair value (asset) 0 [1] 0 [1]
Fair value of investment and derivative assets 102 116
Liabilities [Abstract]    
Other liabilities 0 0
Derivative contracts at fair value (liability) 0 [2] 0 [2]
Fair value of derivative and other liabilities 0 0
Total fair value [Member]
    
Assets [Abstract]    
Marketable equity and debt securities 5 1
Trading securities 102 116
Derivative contracts, at fair value (asset) 72 [1] 1 [1]
Fair value of investment and derivative assets 179 118
Liabilities [Abstract]    
Other liabilities 29 16
Derivative contracts at fair value (liability) 25 [2] 35 [2]
Fair value of derivative and other liabilities $ 54 $ 51
[1] Amounts are classified within other assets in our consolidated balance sheets.
[2] Amounts are classified within accrued expenses and other liabilities in our consolidated balance sheets.