Pensions FV Assets (Details) - Pension Plans, Defined Benefit [Member] - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
United States
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		$ 1,201	$ 1,091	$ 1,181
United States | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	$ 1,201	1,091
United States | U.S. Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		10.00%
Fair Value of Plan Assets		$ 122	104
United States | U.S. Equity Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	$ 122	104
United States | International Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		10.00%
Fair Value of Plan Assets		$ 116	103
United States | International Equity Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	$ 116	103
United States | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		80.00%
Fair Value of Plan Assets		$ 951	868
United States | Fixed Income Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	951	868
United States | Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		12	16
United States | Money Market Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	12	16
Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		986	932	$ 1,011
Foreign Plan [Member] | Quoted Prices in Active Markets (Level I) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		9	5
Foreign Plan [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		237	237
Foreign Plan [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	740	690
Foreign Plan [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		430	299
Foreign Plan [Member] | Fixed Income Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	430	299
Foreign Plan [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		37	43
Foreign Plan [Member] | Equity Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	37	43
Foreign Plan [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		61	61
Foreign Plan [Member] | Hedge Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	61	61
Foreign Plan [Member] | Multi-asset Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		76	97
Foreign Plan [Member] | Multi-asset Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	76	97
Foreign Plan [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		4	20
Foreign Plan [Member] | Alternative Investments [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	4	20
Foreign Plan [Member] | Derivative Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		129	169
Foreign Plan [Member] | Derivative Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	129	169
Foreign Plan [Member] | Insurance Contracts [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		237	237
Foreign Plan [Member] | Insurance Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		237	237
Foreign Plan [Member] | Cash / Money Market Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		12	6
Foreign Plan [Member] | Cash / Money Market Funds [Member] | Quoted Prices in Active Markets (Level I) [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets		9	5
Foreign Plan [Member] | Cash / Money Market Funds [Member] | Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair Value of Plan Assets	[1]	$ 3	$ 1
Foreign Plan [Member] | Minimum [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0.00%
Foreign Plan [Member] | Minimum [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0.00%
Foreign Plan [Member] | Minimum [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0.00%
Foreign Plan [Member] | Minimum [Member] | Multi-asset Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0.00%
Foreign Plan [Member] | Minimum [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0.00%
Foreign Plan [Member] | Minimum [Member] | Derivative Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		0.00%
Foreign Plan [Member] | Maximum [Member] | Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		70.00%
Foreign Plan [Member] | Maximum [Member] | Equity Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		25.00%
Foreign Plan [Member] | Maximum [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		20.00%
Foreign Plan [Member] | Maximum [Member] | Multi-asset Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		100.00%
Foreign Plan [Member] | Maximum [Member] | Alternative Investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		5.00%
Foreign Plan [Member] | Maximum [Member] | Derivative Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage		30.00%

[1] Investments measured at the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy.