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Restructuring - Narrative (Details) - Cost Alignment Plan - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 10 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2016
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pre-tax charges recorded during period | $ 5 | $ 229 | $ 4 |
Restructuring liabilities | 112 | $ 222 | 112 | $ 112
Pre-tax restructuring charges incurred to-date |  |  |  | 233
Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected total pre-tax charges | 250 |  | 250 | 250
Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected total pre-tax charges | 270 |  | 270 | 270
Other Accrued Liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring liabilities | 71 |  | 71 | 71
Other Noncurrent Liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring liabilities | 41 |  | 41 | $ 41
Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Payments for severance | $ 18 |  | $ 89 |

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