Financial Instruments Cross-currency forward-exchange contracts (Details) - Derivatives Designated as Hedging Instruments: - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 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 $0 and $(2) for the three months ended June 30, 2024 and 2023, respectively, and $5 and $(4) for the six months ended June 30, 2024 and 2023, respectively	$ 1	$ 1	$ 3	$ 0
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 $0 and $(2) for the three months ended June 30, 2024 and 2023, respectively, and $5 and $(4) for the six months ended June 30, 2024 and 2023, respectively	$ 2	$ (7)	$ 18	$ (13)