Supplemental financial information - Other income (expense), net (OI&E) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure Text Block Supplement [Abstract]
Other income	[1]	$ 197	$ 150	$ 163
Other expense	[2]	(22)	(52)	(88)
Total		$ 175	$ 98	$ 75

[1] Other income includes interest, royalty and lease income, as well as investment gains and losses.

[2] Other expense includes a portion of pension and other retiree benefit costs. It also includes currency gains and losses, tax interest and miscellaneous items.