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Hedging Activities - Narrative (Details) € in Millions, £ in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2023 USD ($)	Mar. 31, 2023 EUR (€)	Mar. 31, 2023 GBP (£)	Feb. 28, 2023 GBP (£)	Mar. 31, 2022 USD ($)	Mar. 31, 2022 EUR (€)
Derivative [Line Items]
Total debt	$ 5,594				$ 5,879
Gain on derivative termination	97
Disposal Group, Disposed of by Sale, Not Discontinued Operations | European Businesses (Disposal Group)
Derivative [Line Items]
Reclassification from AOCI, current period, before tax	112
Disposal Group, Disposed of by Sale, Not Discontinued Operations | U.K. Businesses (Disposal Group)
Derivative [Line Items]
Reclassification from AOCI, current period, before tax, attributable to parent	26
Fair Value Hedges | Interest Rate Swap | Derivatives Designated for Hedge Accounting | USD
Derivative [Line Items]
Notional amounts of derivative	1,250				0
Fair Value Hedges | Interest Rate Swap Entered Into YTD | Derivatives Designated for Hedge Accounting | USD
Derivative [Line Items]
Notional amounts of derivative	1,300
Cash Flow Hedging | Interest Rate Swap | Derivatives Designated for Hedge Accounting
Derivative [Line Items]
Notional amounts of derivative	450
Cash Flow Hedging | Fixed interest rate swaps | Derivatives Designated for Hedge Accounting | USD
Derivative [Line Items]
Notional amounts of derivative	450				$ 500
Derivative, notional mount, terminated	500
Currency Swap | Net Investment Hedging | Derivatives Designated for Hedge Accounting | EUR
Derivative [Line Items]
Notional amounts of derivative | €		€ 1,100				€ 1,100
Currency Swap | Fair Value Hedges | Derivatives Designated for Hedge Accounting | EUR
Derivative [Line Items]
Notional amounts of derivative		€ 1,100		£ 450		€ 0
British Pound Sterling Denominated Notes | Loans payable
Derivative [Line Items]
Total debt | £			£ 450
Euro Denominated Notes | Net Investment Hedging | Derivatives Designated for Hedge Accounting
Derivative [Line Items]
Reclassification from AOCI, current period, before tax	$ 112

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