Segment Information - Revenue and Tangible Long-lived Assets by Geographical Areas (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		$ 9,483	$ 8,866	$ 8,998
Long-Lived Assets	[1]	1,285	1,304
Ireland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		118	130	197
Long-Lived Assets	[1]	10	11
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		5,011	4,760	4,621
Long-Lived Assets	[1]	408	465
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		1,723	1,563	1,632
Long-Lived Assets	[1]	512	496
Rest of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		2,631	2,413	2,548
Long-Lived Assets	[1]	355	332
Total Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue		9,365	8,736	$ 8,801
Long-Lived Assets	[1]	$ 1,275	$ 1,293

[1] Tangible long-lived assets consist of fixed assets and ROU assets.