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Other Assets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Other assets      
Restricted cash $ 584 $ 4,172  
Deferred tax assets, net 2,875 3,397  
Goodwill 3,172 2,639 2,328
Prepaid expenses 2,378 1,802  
Derivative assets 915 1,071  
Other intangible assets, at amortized cost 1,149 972  
Other 1,582 1,315  
Other assets (includes restricted cash of consolidated variable interest entities) 12,655 15,368  
Prepaid Miles And Reward Points [Member]
      
Other assets      
Prepaid expenses $ 1,800 $ 1,200