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Other Assets (Details Textuals) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Other Assets [Line Items] |  |  |
Prepaid expenses | $ 1,960,000,000 | $ 2,378,000,000 |
Restricted cash | 568,000,000 | 584,000,000 |
Other intangible assets, at amortized cost | 993,000,000 | 1,149,000,000 |
Other Assets (Textuals) [Abstract] |  |  |
Goodwill impaired | 0 | 0 |
Accumulated goodwill impairment losses | 0 | 0 |
Amortization expense | 198,000,000 | 189,000,000 | 176,000,000
Affordable housing partnership interests | 427,000,000 | 332,000,000 |
Customer Relationships [Member] |  |  |
Other Assets [Line Items] |  |  |
Other intangible assets, at amortized cost | 712,000,000 | 816,000,000 |
Other Contracts [Member] |  |  |
Other Assets [Line Items] |  |  |
Other intangible assets, at amortized cost | 281,000,000 | 333,000,000 |
Minimum [Member] |  |  |
Other Assets [Line Items] |  |  |
Amortization period of intangible assets | 1 year 0 months 0 days |  |
Amortization period of acquired finite-lived intangible assets | 6 years 0 months 0 days |  |
Maximum [Member] |  |  |
Other Assets [Line Items] |  |  |
Amortization period of intangible assets | 22 years 0 months 0 days |  |
Amortization period of acquired finite-lived intangible assets | 13 years 0 months 0 days |  |
Coupon and Certain Asset-Backed Securitization Maturities [Member] |  |  |
Other Assets [Line Items] |  |  |
Restricted cash | 76,000,000 | 207,000,000 |
Airline [Member] | Customer Relationships [Member] |  |  |
Other Assets [Line Items] |  |  |
Other intangible assets, at amortized cost | 358,000,000 | 410,000,000 |
Airline [Member] | Delta [Member] | Customer Relationships [Member] |  |  |
Other Assets [Line Items] |  |  |
Other intangible assets, at amortized cost | 156,000,000 | 195,000,000 |
Prepaid Miles And Reward Points [Member] | Airline [Member] |  |  |
Other Assets [Line Items] |  |  |
Prepaid expenses | 1,400,000,000 | 1,800,000,000 |
Prepaid Miles And Reward Points [Member] | Airline [Member] | Delta [Member] |  |  |
Other Assets [Line Items] |  |  |
Prepaid expenses | $ 1,100,000,000 | $ 1,500,000,000 |

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- Definition Represents the amount of the Company's affordable housing partnership interests, included in other assets. + References No definition available. + Details
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