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Restructuring, Impairment and Related Charges - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pre-tax restructuring, impairment and related charges | $ 45 | $ 82 |  | $ 68 | $ 178 |
After-tax restructuring, impairment and related charges | 35 | 67 |  | 52 | 152 |
Pre-tax impairment charge |  |  | $ 20 |  |  |
After-tax impairment charges |  |  | $ 16 |  |  |
Strategic Growth Initiative Plan |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Net restructuring, impairment and related charges recognized | 3 |  |  | 7 |  |
Net restructuring, impairment and related charges recognized, after tax | 3 |  |  | 6 |  |
Pre-tax charges recorded to-date | 142 |  |  | 142 |  |
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] |  |  |  |  |  |
Pre-tax charges recorded to-date | 53 |  |  | 53 |  |
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 | 12 |  |  | 20 |  |
Net restructuring, impairment and related charges recognized, after tax | 9 |  |  | 15 |  |
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 | 202 |  |  | 202 |  |
Strategic Growth Initiative Plan - Other | Project consulting fee |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Net restructuring, impairment and related charges recognized | 28 |  |  | 39 |  |
Net restructuring, impairment and related charges recognized, after tax | 22 |  |  | 30 |  |
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 |  |
Fiscal 2019 Initiatives |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Net restructuring, impairment and related charges recognized | 43 | $ 75 |  | 66 | $ 144 |
Restructuring liabilities | 141 |  |  | 141 |  | $ 150
Fiscal 2019 Initiatives | Other accrued liabilities |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring liabilities | 119 |  |  | 119 |  | 117
Fiscal 2019 Initiatives | Other noncurrent liabilities |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring liabilities | 22 |  |  | 22 |  | 33
Other plans |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring liabilities | $ 48 |  |  | $ 48 |  | $ 87

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