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Restructuring Charges (Narrative) (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2015 USD ($) | Dec. 31, 2016 USD ($) employee | Dec. 31, 2015 USD ($) employee | Dec. 31, 2014 USD ($) | Jun. 30, 2016 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Estimated recognize pre-tax restructuring charges |  |  |  |  | $ 213
Expected annualized savings |  | $ 36 |  |  |
Restructuring charges |  | 41 | $ 172 | $ 0 |
Rebranding of Trade Name |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges | $ 119 | 0 | 119 |  |
Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  | $ 22 | $ 25 |  |
Number of positions eliminated | employee |  | 201 | 230 |  |
Release of sublease loss reserve |  | $ 17 |  |  |
Facility Consolidation |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  |  | $ 10 |  |
Facilities-related |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  | 1 | 0 |  |
Release of sublease loss reserve |  |  | 10 |  |
Asset impairments |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring charges |  | $ 8 | $ 18 |  |

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