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Debt and Financing Activities - Long-Term Debt (Details) € in Millions |  |  |  |  |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 15, 2023 USD ($) | Feb. 13, 2023 USD ($) | Dec. 15, 2022 USD ($) | Aug. 12, 2021 USD ($) | Jul. 17, 2021 USD ($) | Jul. 17, 2021 EUR (€) | Dec. 03, 2020 USD ($) | Dec. 01, 2020 USD ($) | Nov. 30, 2020 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Jul. 23, 2021
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  |  | $ 5,600,000,000 | $ 5,900,000,000 |  |
Current portion of long-term debt |  |  |  |  |  |  |  |  |  | 968,000,000 | 799,000,000 |  |
Retired and redeemed outstanding principal amount |  |  |  |  |  |  |  |  |  | $ 1,274,000,000 | $ 1,648,000,000 | $ 1,040,000,000 |
Loans payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption price (percent) |  |  |  |  |  |  |  |  |  | 101.00% |  |  |
5.25% Notes Due 2026 | Loans payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt instruments (percent) |  | 5.25% |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance, net |  | $ 497,000,000 |  |  |  |  |  |  |  |  |  |  |
Redemption price (percent) |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
1.30% Notes due August 15, 2026 | Loans payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt instruments (percent) |  |  |  | 1.30% |  |  |  |  |  | 1.30% |  |  |
Aggregate principal amount |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |
Proceeds from issuance, net |  |  |  | $ 495,000,000 |  |  |  |  |  |  |  |  |
2.85% Notes due March 15, 2023 | Loans payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt instruments (percent) |  |  | 2.85% |  |  |  |  |  |  | 2.85% |  |  | 2.85%
Retired and redeemed outstanding principal amount | $ 360,000,000 |  |  |  |  |  |  |  |  |  |  |  |
2.70% Notes due December 15, 2022 | Loans payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt instruments (percent) |  |  | 2.70% |  |  |  |  |  |  | 2.70% |  |  |
Retired and redeemed outstanding principal amount |  |  | $ 400,000,000 |  |  |  |  |  |  |  |  |  |
0.63% Euro Notes Due August 17, 2021 | Loans payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt instruments (percent) |  |  |  |  | 0.63% | 0.63% |  |  |  |  |  |  |
Retired and redeemed outstanding principal amount |  |  |  |  | $ 709,000,000 | € 600 |  |  |  |  |  |  |
4.75% Notes Due March 1, 2021 | Loans payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt instruments (percent) |  |  |  |  |  |  |  | 4.75% |  |  |  |  |
Retired and redeemed outstanding principal amount |  |  |  |  |  |  |  | $ 323,000,000 |  |  |  |  |
Notes Due November 30, 2020 | Loans payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt instruments (percent) |  |  |  |  |  |  |  |  | 3.65% |  |  |  |
Retired and redeemed outstanding principal amount |  |  |  |  |  |  |  |  | $ 700,000,000 |  |  |  |
5.25% Notes due February 15, 2026 | Loans payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt instruments (percent) |  |  |  |  |  |  |  |  |  | 5.25% |  |  |
0.90% Notes due December 3, 2025 | Loans payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt instruments (percent) |  |  |  |  |  |  | 0.90% |  |  | 0.90% |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 500,000,000 |  |  |  |  |  |
Proceeds from issuance, net |  |  |  |  |  |  | $ 496,000,000 |  |  |  |  |  |

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