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Restructuring, Impairment and Related Charges - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net restructuring, impairment and related charges recognized | $ 60 | $ 45 | $ 116 | $ 68 |
Restructuring liabilities | 155 |  | 155 |  | $ 157
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax charges recorded to-date | 90 |  | 90 |  |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected total pre-tax charges | 90 |  | 90 |  |
Strategic Growth Initiative Plan - Relocation of Corporate Headquarters | Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected total pre-tax charges | 125 |  | 125 |  |
Operating Model and Cost Optimization Programs |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax charges recorded to-date | 271 |  | 271 |  |
Operating Model and Cost Optimization Programs | Minimum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected total pre-tax charges | 300 |  | 300 |  |
Operating Model and Cost Optimization Programs | Maximum |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected total pre-tax charges | 320 |  | 320 |  |
Strategic Growth Initiative Plan | International |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Net restructuring, impairment and related charges recognized | 27 |  | 41 |  |
Strategic Growth Initiative Plan | Minimum | International |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected total pre-tax charges | 100 |  | 100 |  |
Strategic Growth Initiative Plan | Maximum | International |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Expected total pre-tax charges | $ 120 |  | $ 120 |  |

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