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Restructuring Narrative (Details) - 2017 Plan $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) job_elimination
Restructuring Cost and Reserve [Line Items] |  |
Expected total cost | $ 750 | $ 750
Number of positions eliminated to date | job_elimination |  | 1,785
Costs incurred | 155 | $ 299
Workforce reduction |  |
Restructuring Cost and Reserve [Line Items] |  |
Expected total cost | 303 | 303
Costs incurred | 102 | 205
Technology rationalization |  |
Restructuring Cost and Reserve [Line Items] |  |
Expected total cost | 146 | 146
Costs incurred | 7 | 10
Lease consolidation |  |
Restructuring Cost and Reserve [Line Items] |  |
Expected total cost | 80 | 80
Costs incurred | 1 | 4
Asset impairments |  |
Restructuring Cost and Reserve [Line Items] |  |
Expected total cost | 40 | 40
Costs incurred | 11 | 24
Other Restructuring |  |
Restructuring Cost and Reserve [Line Items] |  |
Expected total cost | 181 | 181
Costs incurred | 34 | 56
Non-cash charges for asset impairments and lease consolidations |  |
Restructuring Cost and Reserve [Line Items] |  |
Expected total cost | $ 50 | $ 50
Minimum |  |
Restructuring Cost and Reserve [Line Items] |  |
Expected number of positions eliminated | job_elimination |  | 2,400
Maximum |  |
Restructuring Cost and Reserve [Line Items] |  |
Expected number of positions eliminated | job_elimination |  | 2,850

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