Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 158	$ (134)	$ 276	$ (109)
Other comprehensive income (loss), net of tax
Foreign currency translation gain (loss), net of tax effect of $3, $4, $(3) and $(7)	15	21	(27)	(44)
Defined benefit plans adjustments, net of tax effect of $—, $—, $— and $2	0	0	0	(5)
Other comprehensive income (loss)	15	21	(27)	(49)
Comprehensive income (loss)	173	(113)	249	(158)
Less: Comprehensive income (loss) attributable to noncontrolling interests	5	0	3	(3)
Comprehensive income (loss) attributable to XPO	$ 168	$ (113)	$ 246	$ (155)