Employee Benefit Plans - Domestic Operations and Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension | U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 22	$ 30	$ 17
Interest cost	83	78	93
Expected return on plan assets	(108)	(134)	(140)
Curtailment	(10)	0	0
Settlement	17	3	0
Net amortization	19	25	32
Net periodic benefit cost (credit)	23	2	2
Pension | United Kingdom
Defined Benefit Plan Disclosure [Line Items]
Service cost	14	16	16
Interest cost	35	31	40
Expected return on plan assets	(92)	(111)	(101)
Settlement	0	10	17
Net amortization	24	55	43
Net periodic benefit cost (credit)	(19)	1	15
Other Postretirement
Defined Benefit Plan Disclosure [Line Items]
Service cost	11	12	7
Interest cost	20	19	21
Expected return on plan assets	(29)	(22)	(34)
Curtailment	0	0	0
Settlement	0	0	0
Net amortization	(1)	(3)	(4)
Net periodic benefit cost (credit)	$ 1	$ 6	$ (10)