Benefit Plans - Projected Benefit Obligations, Plan Assets and Funded Status of Pension Plans (Details) - Pension Plans - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	$ 10,973
Fair value of plan assets at December 31	9,908	$ 10,973
U.S. Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at January 1	1,762	1,614
Service cost	43	46	$ 57
Interest cost	61	62	61
Benefits paid	(29)	(32)
Settlements paid	(118)	(111)
Actuarial (gains)/losses	(208)	179
Divestiture	0	0
Currency	0	0
Other	0	4
Projected benefit obligation at December 31	1,511	1,762	1,614
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	1,717	1,620
Actual return on plan assets	(99)	217
Contributions	39	23
Benefits paid	(29)	(32)
Settlements paid	(118)	(111)
Divestiture	0	0
Currency	0	0
Fair value of plan assets at December 31	1,510	1,717	1,620
Net pension (liabilities)/assets at December 31	(1)	(45)
Non-U.S. Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at January 1	10,852	9,814
Service cost	146	156	147
Interest cost	199	199	229
Benefits paid	(462)	(471)
Settlements paid	(2)	0
Actuarial (gains)/losses	(640)	180
Divestiture	0	(14)
Currency	(528)	976
Other	13	12
Projected benefit obligation at December 31	9,578	10,852	9,814
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at January 1	9,327	7,926
Actual return on plan assets	(243)	592
Contributions	323	482
Benefits paid	(462)	(471)
Settlements paid	(2)	0
Divestiture	0	0
Currency	(478)	798
Fair value of plan assets at December 31	8,465	9,327	$ 7,926
Net pension (liabilities)/assets at December 31	$ (1,113)	$ (1,525)

The increase in the fair value of plan assets from contributions.

No definition available.

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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of decrease in benefit obligation of defined benefit plan from disposal or classification as held-for-sale.

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Amount of decrease in plan assets of defined benefit plan from disposal or classification as held-for-sale.

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- Definition

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 foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan.

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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 cost recognized for passage of time related to defined benefit plan.

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Amount of increase (decrease) in benefit obligation of defined benefit plan from change, classified as other.

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Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of foreign currency translation gain (loss) which increases (decreases) plan assets of defined benefit plan.

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

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Amount of (increase) decrease to benefit obligation of defined benefit plan from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Includes, but is not limited to, lump-sum cash payment to participant in exchange for right to receive specified benefits, purchase of nonparticipating annuity contract and change from remeasurement.

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Amount of payment, which decreases plan assets of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract.

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