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Hedging Activities - Narrative (Details) £ in Millions, $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2022 EUR (€) | Mar. 31, 2022 CAD ($) | Mar. 31, 2021 EUR (€) | Mar. 31, 2021 CAD ($) | Apr. 27, 2020 USD ($) | Apr. 27, 2020 EUR (€) | Mar. 31, 2020 GBP (£) | Dec. 31, 2019 EUR (€) | Sep. 30, 2019 GBP (£)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total debt outstanding | $ 5,879,000,000 | $ 7,148,000,000 |  |  |  |  |  |  |  |  |  |
Gains (losses) from net investment hedges | 73,000,000 | (118,000,000) | $ 39,000,000 |  |  |  |  |  |  |  |  |
Gains recorded in earnings for ineffectiveness of Company's non-derivative hedges |  |  | 34,000,000 |  |  |  |  |  |  |  |  |
Gains (losses) recorded in other comprehensive income | $ 14,000,000 | (36,000,000) | 86,000,000 |  |  |  |  |  |  |  |  |
Amortization of loss on derivative, term (in years) | 5 years |  |  |  |  |  |  |  |  |  |  |
Forward Contracts to Offset Impact of Ineffectiveness of Net investment Hedges | Derivatives Not Designated for Hedge Accounting |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) from contracts not designated as hedges |  |  | (44,000,000) |  |  |  |  |  |  |  |  |
Forward Contracts to Hedge Euro Against British Pound Cash Flows | Derivatives Not Designated for Hedge Accounting |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts of derivative | $ 0 | 39,000,000 |  |  |  |  |  |  |  |  |  |
Net Investment Hedging | Derivatives Designated for Hedge Accounting |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) from net investment hedges | (4,000,000) | (119,000,000) | 76,000,000 |  |  |  |  |  |  |  |  |
Net Investment Hedging | November 2018 Cross Currency Swaps | Derivatives Designated for Hedge Accounting |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts of derivative |  |  |  |  | $ 500 |  | $ 500 |  |  | £ 932 |  |
Proceeds from termination of swaps |  |  | 84,000,000 |  |  |  |  |  |  |  |  |
Settlement gain recorded in earnings |  |  | 34,000,000 |  |  |  |  |  |  |  |  |
Cash Flow Hedging | Derivatives Designated for Hedge Accounting |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gains (losses) recorded in other comprehensive income | 21,000,000 | (42,000,000) | $ 98,000,000 |  |  |  |  |  |  |  |  |
Cash Flow Hedging | Currency Swap | Derivatives Designated for Hedge Accounting |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts of derivative | 1,300,000,000 | $ 2,600,000,000 |  |  |  |  |  |  |  |  |  |
Cash Flow Hedging | Interest Rate Swap | Derivatives Designated for Hedge Accounting |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts of derivative | $ 500,000,000 |  |  |  |  |  |  | $ 500,000,000 | € 600,000,000 |  | € 250,000,000 |
Euro Denominated Notes | Loans payable | Net Investment Hedging |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total debt outstanding | € |  |  |  | € 1,100,000,000 |  | € 1,700,000,000 |  |  |  |  |  |
British Pound Sterling Denominated Notes | Loans payable |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total debt outstanding | £ |  |  |  |  |  |  |  |  |  |  |  | £ 450

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