Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (57)	$ 98	$ 219	$ (11)
Other comprehensive income (loss), net of tax
Foreign currency translation gain (loss), net of tax effect of $7, $13, $4 and $6	(47)	71	(74)	27
Unrealized gain (loss) on financial assets/liabilities designated as hedging instruments, net of tax effect of $1, $—, $1 and $—	(3)	(1)	(3)	(1)
Defined benefit plans adjustments, net of tax effect of $(9), $(1), $(9) and $1	28	(2)	28	(7)
Other comprehensive income (loss)	(22)	68	(49)	19
Comprehensive income (loss)	(79)	166	170	8
Less: Comprehensive income attributable to noncontrolling interests	0	10	3	7
Comprehensive income (loss) attributable to XPO	$ (79)	$ 156	$ 167	$ 1