Financial Instruments Cross-currency forward-exchange contracts (Details) - Derivatives Designated as Hedging Instruments: - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Forward-starting interest rate swap contracts
Foreign Currency Fair Value Hedge Derivative [Line Items]
Unrealized (losses)/gains on derivatives for net investment hedges, net of tax of $(2) and $9 for the three months ended June 30, 2023 and 2022, respectively, and $(4) and $13 for the six months ended June 30, 2023 and 2022, respectively	$ 1	$ 21	$ 0	$ 47
Foreign exchange derivative instruments
Foreign Currency Fair Value Hedge Derivative [Line Items]
Unrealized (losses)/gains on derivatives for net investment hedges, net of tax of $(2) and $9 for the three months ended June 30, 2023 and 2022, respectively, and $(4) and $13 for the six months ended June 30, 2023 and 2022, respectively	$ (7)	$ 33	$ (13)	$ 45