Hedging Activities - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) - Derivatives designated for hedge accounting: € in Millions, £ in Millions, $ in Millions, $ in Millions	Mar. 31, 2024 EUR (€)	Mar. 31, 2024 CAD ($)	Mar. 31, 2024 GBP (£)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 GBP (£)	Jun. 15, 2023 USD ($)	Mar. 31, 2023 EUR (€)	Mar. 31, 2023 CAD ($)	Mar. 31, 2023 GBP (£)	Mar. 31, 2023 USD ($)
Cross-currency swaps | Net Investment Hedges | CAD
Derivatives, Fair Value [Line Items]
Notional amounts of derivative		$ 1,500						$ 1,500
Cross-currency swaps | Fair Value Hedges | GBP
Derivatives, Fair Value [Line Items]
Notional amounts of derivative | £			£ 450						£ 450
Cross-currency swaps | Fair Value Hedges | EUR
Derivatives, Fair Value [Line Items]
Notional amounts of derivative | €	€ 1,100						€ 1,100
Cross-currency swaps | Cash Flow Hedging | CAD
Derivatives, Fair Value [Line Items]
Notional amounts of derivative		$ 0						$ 400
Floating interest rate swaps | Fair Value Hedges | USD
Derivatives, Fair Value [Line Items]
Notional amounts of derivative				$ 1,250						$ 1,250
Floating interest rate swaps | Cash Flow Hedging
Derivatives, Fair Value [Line Items]
Notional amounts of derivative						$ 500
Foreign currency forwards | Cash Flow Hedging | GBP
Derivatives, Fair Value [Line Items]
Notional amounts of derivative | £			£ 39		£ 45				£ 0
Fixed interest rate swaps | Cash Flow Hedging | USD
Derivatives, Fair Value [Line Items]
Notional amounts of derivative				$ 0						$ 450