Financial Instruments Cross-currency forward-exchange contracts (Details) - Derivatives Designated as Hedging Instruments: - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
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 $9 and $(2) for the three months ended June 30, 2022 and 2021; and $13 and $5 for the six months ended June 30, 2022 and 2021, respectively	$ 21	$ (20)	$ 47	$ 19
Cross-currency 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 $9 and $(2) for the three months ended June 30, 2022 and 2021; and $13 and $5 for the six months ended June 30, 2022 and 2021, respectively	$ 33	$ (8)	$ 45	$ 17