Employee Benefits - Reconciliation of the changes in the benefit obligations and fair value of assets and a statement of the funded status (Details) - Pension Plan - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
U.S.
Change in projected benefit obligation
Balance at the beginning of the Period		$ 3,164	$ 3,380
Service cost		0	0	$ 0
Interest cost		73	57	85
Settlements		(283)	0
Actuarial (gain) loss		(607)	(103)
Benefit payments		(167)	(170)
Foreign currency impact		0	0
Balance at the end of the period		2,180	3,164	3,380
Accumulated benefit obligation at end of year		2,180	3,164
Change in fair value of plan assets
Balance at the beginning of the period		2,378	2,276
Actual return on plan assets		(484)	211
Employer contributions		37	61
Settlements	$ (280)	(283)	0
Benefit payments		(167)	(170)
Foreign currency impact		0	0
Balance at the end of the period		1,481	2,378	2,276
Market related value at end of year		1,794	2,174
Funded status		(699)	(786)
Unrecognized prior-service cost		0	0
Unrecognized loss		1,305	1,551
Net amount recognized		606	765
U.K.
Change in projected benefit obligation
Balance at the beginning of the Period		4,919	5,406
Service cost		1	1	0
Interest cost		83	65	88
Settlements		0	(14)
Actuarial (gain) loss		(1,418)	(292)
Benefit payments		(195)	(189)
Foreign currency impact		(444)	(58)
Balance at the end of the period		2,946	4,919	5,406
Accumulated benefit obligation at end of year		2,946	4,919
Change in fair value of plan assets
Balance at the beginning of the period		6,246	6,652
Actual return on plan assets		(1,961)	(136)
Employer contributions		7	9
Settlements		0	(14)
Benefit payments		(195)	(189)
Foreign currency impact		(559)	(76)
Balance at the end of the period		3,537	6,246	6,652
Market related value at end of year		3,537	6,246
Funded status		591	1,327
Unrecognized prior-service cost		35	40
Unrecognized loss		1,726	1,215
Net amount recognized		2,352	2,582
Other
Change in projected benefit obligation
Balance at the beginning of the Period		1,531	1,625
Service cost		0	0	0
Interest cost		19	12	19
Settlements		0	0
Actuarial (gain) loss		(322)	24
Benefit payments		(45)	(47)
Foreign currency impact		(89)	(83)
Balance at the end of the period		1,094	1,531	1,625
Accumulated benefit obligation at end of year		1,079	1,504
Change in fair value of plan assets
Balance at the beginning of the period		1,430	1,497
Actual return on plan assets		(284)	46
Employer contributions		15	17
Settlements		0	0
Benefit payments		(45)	(47)
Foreign currency impact		(83)	(83)
Balance at the end of the period		1,032	1,430	$ 1,497
Market related value at end of year		1,032	1,430
Funded status		(62)	(101)
Unrecognized prior-service cost		(6)	(6)
Unrecognized loss		443	489
Net amount recognized		$ 375	$ 382