Financial Instruments (Effects of Derivatives Recognized) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	$ 79	$ (22)	$ 143	$ 37
Interest rate swaps | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	13	(14)	43	21
Euro-denominated notes | Derivatives designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	38	(10)	58	23
Foreign exchange contracts | Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	31	3	43	(5)
Foreign exchange contracts | Derivatives not designated as hedging instruments | Interest expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	28	2	40	5
Foreign exchange contracts | Derivatives not designated as hedging instruments | Operating expense
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	3	1	3
Interest rate caps | Derivatives not designated as hedging instruments
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative gain (loss) recognized in OCI	$ (3)	$ (1)	$ (1)	$ (2)