Employee Benefit Plans - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 5,170	$ 4,834
Fair Value of Plan Assets	3,675	3,190
Benefit Obligation	5,201	4,857
Fair Value of Plan Assets	3,675	3,190
Fair Value of Pension Plan Assets	10,001	8,878
Pension Benefit Obligations	10,906
Net Funded Status	(905)
United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	3,747	3,598
Fair Value of Plan Assets	2,802	2,493
Benefit Obligation	3,747	3,598
Fair Value of Plan Assets	2,802	2,493
Fair Value of Pension Plan Assets	2,802	2,493	$ 2,358
Pension Benefit Obligations	3,747	3,598	3,234
Net Funded Status	(945)	(1,105)
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	1,423	1,236
Fair Value of Plan Assets	873	697
Benefit Obligation	1,454	1,259
Fair Value of Plan Assets	873	697
Fair Value of Pension Plan Assets	7,199	6,385	5,729
Pension Benefit Obligations	7,159	6,492	$ 6,007
Net Funded Status	40	(107)
U.K.
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	4,707
Pension Benefit Obligations	4,218
Net Funded Status	489
Netherlands
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	1,266
Pension Benefit Obligations	1,226
Net Funded Status	40
Canada
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	794
Pension Benefit Obligations	797
Net Funded Status	(3)
Germany
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	0
Pension Benefit Obligations	395
Net Funded Status	(395)
Other
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	432
Pension Benefit Obligations	523
Net Funded Status	(91)
Underfunded Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	3,408	3,261
Fair Value of Plan Assets	2,802	2,493
Benefit Obligation	3,408	3,261
Fair Value of Plan Assets	2,802	2,493
Underfunded Plan \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	921	767
Fair Value of Plan Assets	873	697
Benefit Obligation	942	780
Fair Value of Plan Assets	873	697
Unfunded Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	339	337
Fair Value of Plan Assets	0	0
Benefit Obligation	339	337
Fair Value of Plan Assets	0	0
Fair Value of Pension Plan Assets	0
Pension Benefit Obligations	339
Net Funded Status	(339)
Unfunded Plan \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	502	469
Fair Value of Plan Assets	0	0
Benefit Obligation	512	479
Fair Value of Plan Assets	0	$ 0
Funded Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	2,802
Pension Benefit Obligations	3,408
Net Funded Status	$ (606)

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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