Employee Benefit Plans - Level 3 Rollforward (Details) - United Kingdom - Pension - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	$ 2,363	$ 2,334
Foreign currency exchange rate changes	(236)	(25)
Ending balance	1,363	2,363	$ 2,334
Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	269
Ending balance	214	269
Real estate funds | Level 3
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning balance	269	237	243
Actual return on plan assets still held at period end	(27)	35	(13)
Foreign currency exchange rate changes	(28)	(3)	7
Ending balance	$ 214	$ 269	$ 237