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Restructuring - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pre-tax charge | $ 229 | $ 229 |  |
Severance and employee related costs | 207 |  |  |
Reserve balance | 222 | 222 | $ 0 | $ 0
Other Accrued Liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Reserve balance | 172 | 172 |  |
Other Noncurrent Liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Reserve balance | 50 | 50 |  |
Reduction in Workforce |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and employee related costs | 117 |  |  |
Business Process Initiatives |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Severance and employee related costs | 90 |  |  |
Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected total pre-tax charges | 270 | 270 |  |
Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected total pre-tax charges | $ 290 | $ 290 |  |

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