Derivative instruments (Effective Portion of Unrealized Gain (Loss)) (Details) - Cash flow hedge [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	$ 67	$ (31)	$ 123	$ 77
Foreign currency contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	252	(46)	330	137
Cross-currency swap contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Total unrealized gains (losses)	$ (185)	$ 15	$ (207)	$ (60)