Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance				$ 13,260
Stockholders' equity attributable to parent, ending balance		$ 10,337		10,337
Foreign currency translation [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	[1]	(548)	$ (398)	(489)		$ (400)
Other comprehensive (loss)/income before reclassifications	[1]	(246)	22	(305)		(20)
Amounts reclassified from accumulated other comprehensive income/(loss) (net of income tax)	[1]	0	0	0	[2]	44	[2]
Net current-period other comprehensive (loss)/income	[1]	(246)	22	(305)		24
Stockholders' equity attributable to parent, ending balance	[1]	(794)	(376)	(794)		(376)
Derivative instruments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	[1]	8	15	11		9
Other comprehensive (loss)/income before reclassifications	[1]	(2)	1	(3)		8
Amounts reclassified from accumulated other comprehensive income/(loss) (net of income tax)	[1]	0	(3)	(2)	[2]	(4)	[2]
Net current-period other comprehensive (loss)/income	[1]	(2)	(2)	(5)		4
Stockholders' equity attributable to parent, ending balance	[1]	6	13	6		13
Defined pension and post-retirement benefit costs [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance	[3]	(1,702)	(1,928)	(1,708)		(1,968)
Other comprehensive (loss)/income before reclassifications	[3]	(4)	(1)	(2)		0
Amounts reclassified from accumulated other comprehensive income/(loss) (net of income tax)	[3]	8	14	12	[2]	53	[2]
Net current-period other comprehensive (loss)/income	[3]	4	13	10		53
Stockholders' equity attributable to parent, ending balance	[3]	(1,698)	(1,915)	(1,698)		(1,915)
Total [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity attributable to parent, beginning balance		(2,242)	(2,311)	(2,186)		(2,359)
Other comprehensive (loss)/income before reclassifications		(252)	22	(310)		(12)
Amounts reclassified from accumulated other comprehensive income/(loss) (net of income tax)		8	11	10	[2]	93	[2]
Net current-period other comprehensive (loss)/income		(244)	33	(300)		81
Stockholders' equity attributable to parent, ending balance		$ (2,486)	$ (2,278)	$ (2,486)		$ (2,278)

[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] Includes reclassifications in 2021 of $44 million and $31 million of foreign currency translation and defined pension and post-retirement benefit costs, respectively, attributable to the gain on disposal of our Miller business (see Note 3 — Acquisitions and Divestitures). The net gain on disposal is included in Other income, net in the accompanying condensed consolidated statements of comprehensive income.

[3] 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.