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Restructuring - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 13 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax charge | $ 229 | $ 14 | $ 229 |  |
Severance and employee related costs |  |  | 207 |  |
Reserve balance | 222 | 106 | 222 | $ 106 | $ 0
Other Accrued Liabilities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Reserve balance | 172 | 71 | 172 | 71 |
Other Noncurrent Assets/Liabilities |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Reserve balance | 50 | 35 | 50 | 35 |
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 |  |
Cost Alignment Plan [Member] |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax charges recorded to-date |  |  |  | 243 |
Pre-tax charge | $ 229 |  |  |  |
Cost Alignment Plan [Member] | Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected total pre-tax charges |  | 250 |  | 250 |
Cost Alignment Plan [Member] | Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected total pre-tax charges |  | $ 270 |  | $ 270 |

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