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Restructuring - Narrative (Details) - Cost Alignment Plan - USD ($) $ in Millions | 3 Months Ended | 16 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Mar. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Pre-tax restructuring charges incurred to-date |  |  | $ 246 |
Pre-tax charges recorded during period |  | $ 9 |  |
Other Accrued Liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring liabilities | $ 64 |  | 64 | $ 71
Noncurrent Liabilities |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring liabilities | 35 |  | 35 | $ 35
Severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Payments for severance | 14 | $ 45 |  |
Minimum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected total pre-tax charges | 250 |  | 250 |
Maximum |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected total pre-tax charges | $ 270 |  | $ 270 |

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