Basis of Presentation and Significant Accounting Policies - Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 2,896	$ 3,970	$ 4,010	$ 3,038
Other comprehensive income (loss)	8	(197)	275
Balance at end of period	2,896	3,970	4,010
Foreign Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(120)	(143)	(43)
Other comprehensive (loss) income	33	(96)
Amounts reclassified from AOCI	(10)	(4)
Other comprehensive income (loss)	23	(100)
Balance at end of period	(120)	(143)	(43)
Derivative Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	5	1	7
Other comprehensive (loss) income	10	12
Amounts reclassified from AOCI	(6)	(18)
Other comprehensive income (loss)	4	(6)
Balance at end of period	5	1	7
Defined Benefit Plans Liability
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(31)	(12)	79
Other comprehensive (loss) income	(18)	(89)
Amounts reclassified from AOCI	(1)	(2)
Other comprehensive income (loss)	(19)	(91)
Balance at end of period	(31)	(12)	79
Less: AOCI Attributable to Noncontrolling Interests
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	1	0	(27)
Other comprehensive (loss) income	1	27
Amounts reclassified from AOCI	0	0
Other comprehensive income (loss)	1	27
Balance at end of period	1	0	(27)
AOCI Attributable to XPO
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(145)	(154)	16	$ (194)
Other comprehensive (loss) income	26	(146)
Amounts reclassified from AOCI	(17)	(24)
Other comprehensive income (loss)	9	(170)	223
Balance at end of period	$ (145)	$ (154)	$ 16