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Other Financial Data - Components of Fixed Assets, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Fixed Assets, net |  |  |
Fixed assets, gross | $ 2,325 | $ 2,381 |
Less: Accumulated depreciation | 1,560 | 1,616 |
Fixed assets, net | 765 | 765 |
Depreciation expense including software amortization | 232 | 229 | $ 242
Software |  |  |
Fixed Assets, net |  |  |
Fixed assets, gross | 948 | 1,095 |
Leasehold improvements |  |  |
Fixed Assets, net |  |  |
Fixed assets, gross | 452 | 422 |
Computer equipment |  |  |
Fixed Assets, net |  |  |
Fixed assets, gross | 417 | 358 |
Furniture, fixtures and equipment |  |  |
Fixed Assets, net |  |  |
Fixed assets, gross | 300 | 315 |
Construction in progress |  |  |
Fixed Assets, net |  |  |
Fixed assets, gross | 93 | 76 |
Other |  |  |
Fixed Assets, net |  |  |
Fixed assets, gross | $ 115 | $ 115 |

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