Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2023	Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance		$ 10,016
Stockholders' equity attributable to parent, ending balance		10,096
Foreign currency translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	[1]	(987)	$ (489)
Other comprehensive income/ (loss) before reclassifications	[1]	43	(59)
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)	[1]	0	0
Net current-period other comprehensive income/(loss)	[1]	43	(59)
Stockholders' equity attributable to parent, ending balance	[1]	(944)	(548)
Derivative instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	[1]	9	11
Other comprehensive income/ (loss) before reclassifications	[1]	2	(1)
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)	[1]	0	(2)
Net current-period other comprehensive income/(loss)	[1]	2	(3)
Stockholders' equity attributable to parent, ending balance	[1]	11	8
Defined pension and post-retirement benefit costs [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	[2]	(1,643)	(1,708)
Other comprehensive income/ (loss) before reclassifications	[2]	(1)	2
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)	[2]	9	4
Net current-period other comprehensive income/(loss)	[2]	8	6
Stockholders' equity attributable to parent, ending balance	[2]	(1,635)	(1,702)
Total [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance		(2,621)	(2,186)
Other comprehensive income/ (loss) before reclassifications		44	(58)
(Gain)/loss reclassified from accumulated other comprehensive loss (net of income tax)		9	2
Net current-period other comprehensive income/(loss)		53	(56)
Stockholders' equity attributable to parent, ending balance		$ (2,568)	$ (2,242)

[1] Reclassification adjustments from accumulated other comprehensive loss related to derivative instruments are included in Revenue and Salaries and benefits in the accompanying condensed consolidated statements of comprehensive income. See Note 9 — Derivative Financial Instruments for additional details regarding the reclassification adjustments for the derivative settlements.

[2] Reclassification adjustments from accumulated other comprehensive loss are included in the computation of net periodic pension cost (see Note 12 — Retirement Benefits). These components are included in Other income, net in the accompanying condensed consolidated statements of comprehensive income.