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Debt - Narrative (Details) € in Millions, £ in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2021 USD ($) | Sep. 30, 2021 EUR (€) | Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 EUR (€) | Sep. 30, 2021 GBP (£)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of debt |  |  |  | $ 2,871 | $ 1,476 |  |
Senior Notes | Senior Notes, Due 2023 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of debt | $ 154 |  | $ 319 |  |  |  |
Effective interest rate | 0.0445% |  |  | 4.45% |  | 4.45% | 4.45%
Senior Notes | Senior Notes, Due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 4.125% |  | 4.125% | 4.125%
Debt repurchased |  |  |  | $ 33 |  |  |
Face amount |  |  |  | $ 500 |  |  |
Senior Notes | Senior Notes Due 2027 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 1.80% |  | 1.80% | 1.80%
Face amount |  |  |  | $ 700 |  |  |
Senior Notes | Senior Notes Due 2029 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 2.375% |  | 2.375% | 2.375%
Face amount |  |  |  | $ 650 |  |  |
Senior Notes | Senior Notes Due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Face amount | € |  |  |  |  |  | € 650 |
Senior Notes | Senior Notes Due 2028 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 0.45% |  | 0.45% | 0.45%
Face amount | € |  |  |  |  |  | € 750 |
Senior Notes | Senior Notes Due 2032 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 0.95% |  | 0.95% | 0.95%
Face amount | € |  |  |  |  |  | € 600 |
Senior Notes | Euro Senior Notes Due 2028 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 0.45% |  | 0.45% | 0.45%
Face amount | € |  |  |  |  |  | € 750 |
Senior Notes | Euro Senior Notes Due 2032 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 0.95% |  | 0.95% | 0.95%
Face amount | € |  |  |  |  |  | € 600 |
Senior Notes | Euro Senior Notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repayments of debt | € |  | € 400 |  |  |  |  |
Senior Notes | Senior Notes Due 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 4.25% |  | 4.25% | 4.25%
Face amount |  |  |  | $ 500 |  |  |
Senior Notes | Senior Notes Due 2025 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 2.75% |  | 2.75% | 2.75%
Face amount | £ |  |  |  |  |  |  | £ 250
Senior Notes | U.S. Dollar Senior Notes Due 2027 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 1.80% |  | 1.80% | 1.80%
Face amount |  |  |  | $ 700 |  |  |
Senior Notes | U.S. Dollar Senior Notes Due 2029 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 2.375% |  | 2.375% | 2.375%
Face amount |  |  |  | $ 650 |  |  |
Senior Notes | Senior Notes Due 2028 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 4.75% |  | 4.75% | 4.75%
Face amount |  |  |  | $ 500 |  |  |
Senior Notes | Senior Notes Due 2030 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Effective interest rate |  |  |  | 7.45% |  | 7.45% | 7.45%
Face amount |  |  |  | $ 234 |  |  |

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