Financial Instruments (Effects of Derivatives Recognized) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	$ 28	$ 97	$ 5	$ 240
Interest rate swaps | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	2	22	9	65
Euro-denominated notes | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	23	46	9	104
Foreign exchange contracts | Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	3	27	(1)	1
Interest rate caps | Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	$ 0	$ 2	$ (12)	$ 70