Employee Benefit Plans - Accumulated Benefit Obligation in Excess of Plan Assets (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	$ 4,834	$ 4,393
Fair Value of Plan Assets	3,190	2,982
Benefit Obligation	4,857	4,578
Fair Value of Plan Assets	3,190	3,140
Fair Value of Pension Plan Assets	8,878	8,087
Pension Benefit Obligations	10,090
Net Funded Status	(1,212)
United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	3,598	3,234
Fair Value of Plan Assets	2,493	2,358
Benefit Obligation	3,598	3,234
Fair Value of Plan Assets	2,493	2,358
Fair Value of Pension Plan Assets	2,493	2,358	$ 3,224
Pension Benefit Obligations	3,598	3,234	4,180
Net Funded Status	(1,105)	(876)
Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	1,236	1,159
Fair Value of Plan Assets	697	624
Benefit Obligation	1,259	1,344
Fair Value of Plan Assets	697	782
Fair Value of Pension Plan Assets	6,385	5,729	6,308
Pension Benefit Obligations	6,492	6,007	$ 6,703
Net Funded Status	(107)	(278)
U.K.
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	4,169
Pension Benefit Obligations	3,798
Net Funded Status	371
Netherlands
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	1,083
Pension Benefit Obligations	1,101
Net Funded Status	(18)
Canada
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	721
Pension Benefit Obligations	738
Net Funded Status	(17)
Germany
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	0
Pension Benefit Obligations	367
Net Funded Status	(367)
Other
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	412
Pension Benefit Obligations	488
Net Funded Status	(76)
Underfunded Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	3,261	2,918
Fair Value of Plan Assets	2,493	2,358
Benefit Obligation	3,261	2,918
Fair Value of Plan Assets	2,493	2,358
Underfunded Plan \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	767	713
Fair Value of Plan Assets	697	624
Benefit Obligation	780	888
Fair Value of Plan Assets	697	782
Unfunded Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	337	316
Fair Value of Plan Assets	0	0
Benefit Obligation	337	316
Fair Value of Plan Assets	0	0
Fair Value of Pension Plan Assets	0
Pension Benefit Obligations	337
Net Funded Status	(337)
Unfunded Plan \| Foreign Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated Benefit Obligation	469	446
Fair Value of Plan Assets	0	0
Benefit Obligation	479	456
Fair Value of Plan Assets	0	$ 0
Funded Plan \| United States
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Pension Plan Assets	2,493
Pension Benefit Obligations	3,261
Net Funded Status	$ (768)

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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