Employee Benefit Plans - Pension Plan Assets and Benefit Obligations (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	$ 9,796	$ 10,001
Pension Benefit Obligations	9,915	10,906
Net Funded Status	(119)	(905)
United States
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	2,544	2,802	$ 2,493
Pension Benefit Obligations	3,372	3,747	$ 3,598
Net Funded Status	(828)	(945)
U.K.
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	4,914	4,707
Pension Benefit Obligations	3,870	4,218
Net Funded Status	1,044	489
Netherlands
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	1,174	1,266
Pension Benefit Obligations	1,145	1,226
Net Funded Status	29	40
Canada
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	746	794
Pension Benefit Obligations	747	797
Net Funded Status	(1)	(3)
Germany
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	0	0
Pension Benefit Obligations	346	395
Net Funded Status	(346)	(395)
Other
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	418	432
Pension Benefit Obligations	435	523
Net Funded Status	(17)	(91)
Funded Plan | United States
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	2,544	2,802
Pension Benefit Obligations	3,056	3,408
Net Funded Status	(512)	(606)
Unfunded Plan | United States
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	0	0
Pension Benefit Obligations	316	339
Net Funded Status	$ (316)	$ (339)