Employee Benefit Plans - Actual and Target Allocations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Restructuring and other asset-related charges	$ 0	$ 19	$ 74
Foreign Plan [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Allocation of plan asset, percentage	100.00%	100.00%
Foreign Plan [Member] | Equity Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Allocation of plan asset, percentage	22.00%	23.00%
Foreign Plan [Member] | Debt Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Allocation of plan asset, percentage	58.00%	52.00%
Foreign Plan [Member] | Real Estate [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Allocation of plan asset, percentage	12.00%	13.00%
Foreign Plan [Member] | Other [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Allocation of plan asset, percentage	8.00%	12.00%
U.S. Pension Benefits
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Allocation of plan asset, percentage	100.00%	100.00%
U.S. Pension Benefits | Equity Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Allocation of plan asset, percentage	0.00%	0.00%
U.S. Pension Benefits | Debt Securities [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Allocation of plan asset, percentage	98.00%	96.00%
U.S. Pension Benefits | Real Estate [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Allocation of plan asset, percentage	1.00%	1.00%
U.S. Pension Benefits | Other [Member]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Allocation of plan asset, percentage	1.00%	3.00%
Minimum [Member] | Foreign Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	16.00%
Minimum [Member] | Foreign Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	50.00%
Minimum [Member] | Foreign Plan [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	8.00%
Minimum [Member] | Foreign Plan [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	11.00%
Minimum [Member] | U.S. Pension Benefits | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%
Minimum [Member] | U.S. Pension Benefits | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	95.00%
Minimum [Member] | U.S. Pension Benefits | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%
Minimum [Member] | U.S. Pension Benefits | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%
Maximum [Member] | Foreign Plan [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	26.00%
Maximum [Member] | Foreign Plan [Member] | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	60.00%
Maximum [Member] | Foreign Plan [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	14.00%
Maximum [Member] | Foreign Plan [Member] | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	17.00%
Maximum [Member] | U.S. Pension Benefits | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	0.00%
Maximum [Member] | U.S. Pension Benefits | Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	100.00%
Maximum [Member] | U.S. Pension Benefits | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	2.00%
Maximum [Member] | U.S. Pension Benefits | Other [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage	3.00%