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Equity, Changes in Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income (Loss)        
Beginning balance, accumulated other comprehensive income (loss), net of tax     $ 108  
Net other comprehensive income (loss) 182 133 134 156
Separation of retail business     (479) 0
Ending balance, accumulated other comprehensive income (loss), net of tax 83   83  
Accumulated Other Comprehensive Income (Loss) [Member]
        
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income (Loss)        
Beginning balance, accumulated other comprehensive income (loss), net of tax     108  
Other comprehensive income (loss) before reclassifications     123  
Amounts reclassified from accumulated other comprehensive income (loss)     11  
Net other comprehensive income (loss)     134  
Separation of retail business     (159)  
Ending balance, accumulated other comprehensive income (loss), net of tax 83   83  
Foreign Currency Translation Adjustment [Member]
        
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income (Loss)        
Beginning balance, accumulated other comprehensive income (loss), net of tax     665  
Other comprehensive income (loss) before reclassifications     (87)  
Amounts reclassified from accumulated other comprehensive income (loss)     0  
Net other comprehensive income (loss)     (87)  
Separation of retail business     (159)  
Ending balance, accumulated other comprehensive income (loss), net of tax 419   419  
Defined Benefit Plans Items [Member]
        
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income (Loss)        
Beginning balance, accumulated other comprehensive income (loss), net of tax     (558)  
Other comprehensive income (loss) before reclassifications     214  
Amounts reclassified from accumulated other comprehensive income (loss)     12  
Net other comprehensive income (loss)     226  
Separation of retail business     0  
Ending balance, accumulated other comprehensive income (loss), net of tax (332)   (332)  
Gains (Losses) on Cash Flow Hedges [Member]
        
Changes in the Balances of Each Component of Accumulated Other Comprehensive Income (Loss)        
Beginning balance, accumulated other comprehensive income (loss), net of tax     1  
Other comprehensive income (loss) before reclassifications     (4)  
Amounts reclassified from accumulated other comprehensive income (loss)     (1)  
Net other comprehensive income (loss)     (5)  
Separation of retail business     0  
Ending balance, accumulated other comprehensive income (loss), net of tax $ (4)   $ (4)