Employee Benefits - Amounts recognized in Accumulated other comprehensive loss that have not yet been recognized (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
U.S.
Amounts recognized in Accumulated other comprehensive loss unrecognized as components of net periodic benefit cost
Net loss	$ 1,305	$ 1,551
Prior service cost (income)	0	0
Net amount recognized	1,305	1,551
U.K.
Amounts recognized in Accumulated other comprehensive loss unrecognized as components of net periodic benefit cost
Net loss	1,726	1,215
Prior service cost (income)	35	40
Net amount recognized	1,761	1,255
Other
Amounts recognized in Accumulated other comprehensive loss unrecognized as components of net periodic benefit cost
Net loss	443	489
Prior service cost (income)	(6)	(6)
Net amount recognized	$ 437	$ 483