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Fair Value Measurements Other Segments Fair Value (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 1 [Member]
Dec. 31, 2013
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 1 [Member]
Jun. 30, 2014
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 2 [Member]
Dec. 31, 2013
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 2 [Member]
Jun. 30, 2014
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 3 [Member]
Dec. 31, 2013
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Level 3 [Member]
Jun. 30, 2014
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Total fair value [Member]
Dec. 31, 2013
Other Segments and Holding Company [Member]
Recurring measurement [Member]
Total fair value [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Impairment of Long-Lived Assets Held-for-use $ 2 $ 5                
Fair Value Of Property Plant And Equipment Impaired During Period 2 23                
Assets [Abstract]                    
Marketable equity and debt securities     78 1 3 0 110 0 191 1
Trading securities     0 0 0 0 101 116 101 116
Derivative contracts, at fair value (asset)     0 [1] 0 [1] 74 [1] 1 [1] 0 [1] 0 [1] 74 [1] 1 [1]
Fair value of investment and derivative assets     78 1 77 1 211 116 366 118
Liabilities [Abstract]                    
Other liabilities     0 0 30 16 0 0 30 16
Derivative contracts at fair value (liability)     0 [2] 0 [2] 48 [2] 35 [2] 0 [2] 0 [2] 48 [2] 35 [2]
Fair value of derivative and other liabilities     $ 0 $ 0 $ 78 $ 51 $ 0 $ 0 $ 78 $ 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.