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Summary of Significant Accounting Policies (Details 2) (USD $) In Millions, unless otherwise specified | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | ---
Identified intangible assets by major classification |  |  |
Gross | $ 5,154 | $ 4,908 |
Accumulated Amortization | (1,081) | (805) |
Net book value | 4,073 | 4,103 | 4,052
Customer Relationships [Member] |  |  |
Identified intangible assets by major classification |  |  |
Gross | 3,044 | 2,933 |
Accumulated Amortization | (717) | (536) |
Net book value | 2,327 | 2,397 |
Trade Names [Member] |  |  |
Identified intangible assets by major classification |  |  |
Gross | 643 | 643 |
Accumulated Amortization | 0 | 0 |
Net book value | 643 | 643 |
Trademarks [Member] |  |  |
Identified intangible assets by major classification |  |  |
Gross | 716 | 677 |
Accumulated Amortization | (122) | (95) |
Net book value | 594 | 582 |
Other Finite Lived Intangible Assets [Member] |  |  |
Identified intangible assets by major classification |  |  |
Gross | 751 | 655 |
Accumulated Amortization | (242) | (174) |
Net book value | $ 509 | $ 481 |

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