Financial Instruments Cross-currency forward-exchange contracts (Details) - Derivatives Designated as Hedging Instruments: - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Forward-starting interest rate swap contracts
Foreign Currency Fair Value Hedge Derivative [Line Items]
Unrealized gains/(losses) on derivatives for net investment hedges, net of tax of $5 and $(2) for the three months ended March 31, 2024 and 2023, respectively	$ 2	$ (1)
Foreign exchange derivative instruments
Foreign Currency Fair Value Hedge Derivative [Line Items]
Unrealized gains/(losses) on derivatives for net investment hedges, net of tax of $5 and $(2) for the three months ended March 31, 2024 and 2023, respectively	$ 16	$ (6)