Supplementary Information -Supplemental cash flow (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Guarantees and Product Warranties [Abstract]
Income taxes paid, net of refunds	$ 314	$ 452	$ 446
Interest paid	$ 305	$ 289	$ 285