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Restructuring, Impairment and Related Charges - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Net restructuring, impairment and related charges recognized | $ 136 | $ 110 |  | $ 204 | $ 288 |
Net restructuring, impairment and related charges recognized, after tax | 115 | 92 |  | 167 | 244 |
Pre-tax impairment charge |  |  | $ 20 |  |  |
Impairment of intangible assets |  |  | $ 16 |  |  |
Asset impairment Charge, net of tax | 30 | 35 |  |  |  |
Company recognized a non-cash charge | 30 | 35 |  | 113 | 671 |
Strategic Growth Initiative Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Net restructuring, impairment and related charges recognized | 3 |  |  | 10 |  |
Net restructuring, impairment and related charges recognized, after tax | 2 |  |  | 8 |  |
Pre-tax charges recorded to-date | 145 |  |  | 145 |  |
Strategic Growth Initiative Plan | Minimum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected total pre-tax charges | 140 |  |  | 140 |  |
Strategic Growth Initiative Plan | Maximum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected total pre-tax charges | 180 |  |  | 180 |  |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Net restructuring, impairment and related charges recognized |  | 31 |  |  | 31 |
Net restructuring, impairment and related charges recognized, after tax |  | $ 23 |  |  | $ 23 |
Pre-tax charges recorded to-date | 67 |  |  | 67 |  |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Employee retention expenses, asset impairments and accelerated depreciation |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Net restructuring, impairment and related charges recognized | 14 |  |  | 34 |  |
Net restructuring, impairment and related charges recognized, after tax | 10 |  |  | 25 |  |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Minimum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected total pre-tax charges | 80 |  |  | 80 |  |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Maximum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected total pre-tax charges | 130 |  |  | 130 |  |
Strategic Growth Initiative Plan - Other |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pre-tax charges recorded to-date | 222 |  |  | 222 |  |
Strategic Growth Initiative Plan - Other | Project consulting fee |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Net restructuring, impairment and related charges recognized | 20 |  |  | 59 |  |
Net restructuring, impairment and related charges recognized, after tax | 15 |  |  | 45 |  |
Strategic Growth Initiative Plan - Other | Minimum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected total pre-tax charges | 300 |  |  | 300 |  |
Strategic Growth Initiative Plan - Other | Maximum |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Expected total pre-tax charges | 350 |  |  | 350 |  |
Other plans |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring liabilities | 48 |  |  | 48 |  | $ 87
European Pharmaceutical Solutions |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Asset impairment Charge, net of tax | 53 |  |  | 53 |  |
Company recognized a non-cash charge | $ 64 |  |  | $ 64 |  |

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