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Goodwill, Customer Relationships and Other Intangible Assets (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) segment | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 9,354 | $ 9,354 |
Gross carrying amounts of goodwill, customer relationships and other intangible assets | 17,049 |  |
Amortization expense for intangible assets | $ 871 | 957 | $ 1,029
Number of reporting units | segment | 1 |  |
Weighted average cost of capital to calculate discount rate as of the measurement date (as a percent) | 6.00% |  |
Weighted average cost of capital, cost of equity (as a percent) | 7.60% |  |
Weighted average cost of capital, after-tax cost of debt (as a percent) | 3.30% |  |
Estimated amortization expense for intangible assets |  |  |
2016 | $ 725 |  |
2017 | 661 |  |
2018 | 587 |  |
2019 | 507 |  |
2020 | 435 |  |
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, net | 2,435 | 3,039 |
Accumulated amortization | 3,264 | 2,660 |
Capitalized software |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible assets, net | 613 | 808 |
Accumulated amortization | $ 1,383 | $ 1,247 |

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- Definition Amount before accumulated amortization of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.) + References No definition available. + Details
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