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RETIREMENT PLANS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in projected benefit obligation [Roll Forward]      
Actuarial (gain) loss $ (143,000,000) $ (99,000,000) $ 21,000,000
Amortization of: [Abstract]      
Prior service credit $ 39,000,000 $ 40,000,000 43,000,000
Post Retirement Welfare Plans [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year 6.50%    
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 100.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 100.00% 100.00%  
Change in projected benefit obligation [Roll Forward]      
Benefit obligation, beginning of year $ 672,000,000 $ 738,000,000  
Service cost 0 0 3,000,000
Interest cost 25,000,000 22,000,000 23,000,000
Actuarial (gain) loss 71,000,000 (33,000,000)  
Plan participants' contributions 10,000,000 11,000,000  
Effect of currency exchange 1,000,000 (1,000,000)  
Benefits paid (63,000,000) (65,000,000)  
Benefit obligation, end of year 716,000,000 672,000,000 738,000,000
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 135,000,000 148,000,000  
Actual return on plan assets 27,000,000 (6,000,000)  
Effect of currency exchange 0 0  
Company contributions 42,000,000 43,000,000  
Reserve for third party contributions (12,000,000) 4,000,000  
Plan participants' contributions 10,000,000 11,000,000  
Benefits paid (63,000,000) (65,000,000)  
Fair value of plan assets, end of year 139,000,000 135,000,000 148,000,000
Funded status at end of year (577,000,000) (537,000,000)  
Amounts recognized in the Consolidated Statements of Financial Position consist of [Abstract]      
Other noncurrent asset 50,000,000 41,000,000  
Current liabilities (47,000,000) (45,000,000)  
Post-employment obligations (580,000,000) (533,000,000)  
Net amount recognized, end of year (577,000,000) (537,000,000)  
Amounts recognized in accumulated other comprehensive income consist of [Abstract]      
Prior service (credit) cost (143,000,000) (182,000,000)  
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year (38,000,000)    
Components of net periodic benefit cost [Abstract]      
Service cost 0 0 3,000,000
Interest cost 25,000,000 22,000,000 23,000,000
Expected return on plan assets (5,000,000) (5,000,000) (5,000,000)
Amortization of: [Abstract]      
Prior service (credit) cost (39,000,000) (40,000,000) (40,000,000)
Mark-to-market adjustment 61,000,000 (26,000,000) 23,000,000
Net periodic benefit cost 42,000,000 (49,000,000) 4,000,000
Amortization of: [Abstract]      
Prior service credit (39,000,000) (40,000,000) (40,000,000)
Total $ (39,000,000) $ (40,000,000) $ (40,000,000)
Weighted-average assumptions used to determine benefit obligations for years ended [Abstract]      
Discount rate (in hundredths) 3.21% 4.26% 3.54%
Rate of compensation increase (in hundredths) 3.25% 3.25% 3.25%
Health care cost trend [Abstract]      
Initial (in hundredths) 6.50% 6.50% 6.75%
Decreasing to ultimate trend of (in hundredths) 5.00% 5.00% 5.00%
Weighted-average assumptions used to determine net periodic cost for years ended [Abstract]      
Discount rate ( in hundredths) 4.26% 3.54% 3.91%
Discount rate for service costs 4.05% 3.28% 4.31%
Discount rate for interest costs 3.93% 3.14% 3.28%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 3.75% 3.75% 3.75%
Rate of compensation increase (in hundredths) 3.25% 3.25% 3.25%
Health Care Cost Trend [Abstract]      
Initial (in hundredths) 6.50% 6.75% 7.00%
Decreasing to ultimate trend of (in hundredths) 5.00% 5.00% 5.00%
Projected Year that reaches ultimate trend rate 2025 2025 2021
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components $ 0    
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate 2026 2025 2025
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate 5.00%    
Estimated future benefits payments [Abstract]      
2020 $ 57,000,000    
2021 57,000,000    
2022 53,000,000    
2023 47,000,000    
2024 47,000,000    
2025-2029 $ 223,000,000    
Post Retirement Welfare Plans [Member] | Private Equity Securities [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 0.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 0.00% 0.00%  
Post Retirement Welfare Plans [Member] | Debt Securities [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 100.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 100.00% 100.00%  
Post Retirement Welfare Plans [Member] | Real Estate [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 0.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 0.00% 0.00%  
Post Retirement Welfare Plans [Member] | Other Investment Companies [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage [1] 0.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) [1] 0.00% 0.00%  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year $ 107,000,000    
Fair value of plan assets, end of year 111,000,000 $ 107,000,000  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 3,000,000    
Fair value of plan assets, end of year 0 3,000,000  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 104,000,000    
Fair value of plan assets, end of year 111,000,000 104,000,000  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 0    
Fair value of plan assets, end of year 0 0  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Cash and Cash Equivalents [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 3,000,000    
Fair value of plan assets, end of year [2]   3,000,000  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 3,000,000    
Fair value of plan assets, end of year [2]   3,000,000  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 0    
Fair value of plan assets, end of year [2]   0  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 0    
Fair value of plan assets, end of year [2]   0  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Fixed Income (US) [Member] | Debt Securities [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [3] 78,000,000    
Fair value of plan assets, end of year [3] 85,000,000 78,000,000  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Fixed Income (US) [Member] | Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [3] 0    
Fair value of plan assets, end of year [3] 0 0  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Fixed Income (US) [Member] | Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [3] 78,000,000    
Fair value of plan assets, end of year [3] 85,000,000 78,000,000  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Fixed Income (US) [Member] | Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [3] 0    
Fair value of plan assets, end of year [3] 0 0  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Fixed Income (Non-U.S.) [Member] | Debt Securities [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [3] 26,000,000    
Fair value of plan assets, end of year [3] 26,000,000 26,000,000  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Fixed Income (Non-U.S.) [Member] | Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [3] 0    
Fair value of plan assets, end of year [3] 0 0  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Fixed Income (Non-U.S.) [Member] | Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [3] 26,000,000    
Fair value of plan assets, end of year [3] 26,000,000 26,000,000  
Voluntary employees' beneficiary association (VEBA) trust [Member] | Post Retirement Welfare Plans [Member] | Fixed Income (Non-U.S.) [Member] | Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [3] 0    
Fair value of plan assets, end of year [3] $ 0 $ 0  
Employee stock ownership plan which is a component of Eastman Investment Plan EIP/ESOP [Member]      
Defined Contribution Investment Plan and Employee Stock Ownership Plan      
Anticipated percentage of employer contribution to the plan for all U.S. employees (in hundredths) 5.00%    
Allocated shares in the ESOP (in shares) 2,076,203 2,119,614 2,130,176
Percentage of an employee's remuneration that is being matched by the employer (in hundredths) 7.00%    
Percentage of company match of the first seven percent of employee's compensation contributed to the plan (in hundredths) 50.00%    
Charges for domestic contributions to the Defined Contribution plans $ 68,000,000 $ 67,000,000 $ 64,000,000
Foreign Plan [Member]      
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]      
Projected benefit obligation 972,000,000 840,000,000  
Fair value of plan assets 820,000,000 713,000,000  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Projected benefit obligation 651,000,000 568,000,000  
Accumulated benefit obligation 625,000,000 547,000,000  
Fair value of plan assets 513,000,000 448,000,000  
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 713,000,000    
Fair value of plan assets, end of year 820,000,000 713,000,000  
Foreign Plan [Member] | Investments measured at net asset value [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [4] 609,000,000    
Fair value of plan assets, end of year [4] 691,000,000 609,000,000  
Foreign Plan [Member] | Cash and Cash Equivalents [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 53,000,000    
Fair value of plan assets, end of year [2] 72,000,000 53,000,000  
Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 53,000,000    
Fair value of plan assets, end of year [2] 72,000,000 53,000,000  
Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 0    
Fair value of plan assets, end of year [2] 0 0  
Foreign Plan [Member] | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 0    
Fair value of plan assets, end of year [2] 0 0  
Foreign Plan [Member] | United States [Member] | Public Equity Funds [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [5] 0    
Fair value of plan assets, end of year [5] 0 0  
Foreign Plan [Member] | United States [Member] | Public Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [5] 0    
Fair value of plan assets, end of year [5] 0 0  
Foreign Plan [Member] | United States [Member] | Public Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [5] 0    
Fair value of plan assets, end of year [5] 0 0  
Foreign Plan [Member] | United States [Member] | Public Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [5] 0    
Fair value of plan assets, end of year [5] 0 0  
Foreign Plan [Member] | Other Alternative Investments [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [6] 51,000,000    
Fair value of plan assets, end of year [6] 57,000,000 51,000,000  
Foreign Plan [Member] | Other Alternative Investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [6] 0    
Fair value of plan assets, end of year [6] 0 0  
Foreign Plan [Member] | Other Alternative Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [6] 0    
Fair value of plan assets, end of year [6] 0 0  
Foreign Plan [Member] | Other Alternative Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [6] 51,000,000    
Fair value of plan assets, end of year [6] 57,000,000 51,000,000  
Foreign Plan [Member] | Cash and cash equivalents, public equity, and other investments [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 104,000,000    
Fair value of plan assets, end of year 129,000,000 104,000,000  
Foreign Plan [Member] | Cash and cash equivalents, public equity, and other investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 53,000,000    
Fair value of plan assets, end of year 72,000,000 53,000,000  
Foreign Plan [Member] | Cash and cash equivalents, public equity, and other investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 0    
Fair value of plan assets, end of year 0 0  
Foreign Plan [Member] | Cash and cash equivalents, public equity, and other investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 51,000,000    
Fair value of plan assets, end of year $ 57,000,000 $ 51,000,000  
Foreign Plan [Member] | Pension Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Expected Long-Term Rate of Return on Plan Assets 4.26% 4.49%  
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 100.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 100.00% 100.00%  
Change in projected benefit obligation [Roll Forward]      
Benefit obligation, beginning of year $ 840,000,000 $ 893,000,000  
Service cost 14,000,000 14,000,000 13,000,000
Interest cost 20,000,000 20,000,000 20,000,000
Actuarial (gain) loss 113,000,000 (20,000,000)  
Plan participants' contributions 1,000,000 1,000,000  
Effect of currency exchange 11,000,000 (45,000,000)  
Benefits paid (27,000,000) (23,000,000)  
Benefit obligation, end of year 972,000,000 840,000,000 893,000,000
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 713,000,000 773,000,000  
Actual return on plan assets 102,000,000 (19,000,000)  
Effect of currency exchange 9,000,000 (39,000,000)  
Company contributions 22,000,000 20,000,000  
Reserve for third party contributions 0 0  
Plan participants' contributions 1,000,000 1,000,000  
Benefits paid (27,000,000) (23,000,000)  
Fair value of plan assets, end of year 820,000,000 713,000,000 773,000,000
Funded status at end of year (152,000,000) (127,000,000)  
Amounts recognized in the Consolidated Statements of Financial Position consist of [Abstract]      
Other noncurrent asset 0 0  
Current liabilities (1,000,000) (1,000,000)  
Post-employment obligations (151,000,000) (126,000,000)  
Net amount recognized, end of year (152,000,000) (127,000,000)  
Accumulated benefit obligation basis for all defined benefit pension plans 919,000,000 796,000,000  
Amounts recognized in accumulated other comprehensive income consist of [Abstract]      
Prior service (credit) cost 0 0  
Components of net periodic benefit cost [Abstract]      
Service cost 14,000,000 14,000,000 13,000,000
Interest cost 20,000,000 20,000,000 20,000,000
Expected return on plan assets (32,000,000) (37,000,000) (35,000,000)
Amortization of: [Abstract]      
Prior service (credit) cost 0 1,000,000 1,000,000
Mark-to-market adjustment 43,000,000 36,000,000 (7,000,000)
Net periodic benefit cost 45,000,000 34,000,000 (8,000,000)
Amortization of: [Abstract]      
Prior service credit 0 1,000,000 1,000,000
Total $ 0 $ 1,000,000 $ 1,000,000
Weighted-average assumptions used to determine benefit obligations for years ended [Abstract]      
Discount rate (in hundredths) 1.56% 2.35% 2.25%
Rate of compensation increase (in hundredths) 2.94% 2.94% 2.95%
Weighted-average assumptions used to determine net periodic cost for years ended [Abstract]      
Discount rate ( in hundredths) 2.35% 2.25% 2.33%
Discount rate for service costs 2.35% 2.25% 2.33%
Discount rate for interest costs 2.35% 2.25% 2.33%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 4.49% 4.83% 5.02%
Rate of compensation increase (in hundredths) 2.94% 2.95% 2.94%
Estimated future benefits payments [Abstract]      
2020 $ 31,000,000    
2021 30,000,000    
2022 31,000,000    
2023 34,000,000    
2024 38,000,000    
2025-2029 210,000,000    
Foreign Plan [Member] | Pension Plan [Member] | Other Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [7] 51,000,000 $ 51,000,000  
Defined benefit plan unrealized gains [7] 5,000,000 0  
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchase, Sale, and Settlement [7] 1,000,000    
Fair value of plan assets, end of year [7] $ 57,000,000 $ 51,000,000 $ 51,000,000
Foreign Plan [Member] | Pension Plan [Member] | Private Equity Securities [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 24.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 21.00% 19.00%  
Foreign Plan [Member] | Pension Plan [Member] | Debt Securities [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 57.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 53.00% 54.00%  
Foreign Plan [Member] | Pension Plan [Member] | Real Estate [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 5.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 8.00% 8.00%  
Foreign Plan [Member] | Pension Plan [Member] | Other Investment Companies [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage [1] 14.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) [1] 18.00% 19.00%  
UNITED STATES      
Defined Benefit Plan, Information about Plan Assets [Abstract]      
Amount of defined benefit pension plan funded by the company $ 0    
Defined Benefit Plan, Pension Plan with Project Benefit Obligation in Excess of Plan Assets [Abstract]      
Projected benefit obligation 1,673,000,000 $ 1,726,000,000  
Fair value of plan assets 1,512,000,000 1,585,000,000  
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]      
Projected benefit obligation 1,673,000,000 1,726,000,000  
Accumulated benefit obligation 1,611,000,000 1,667,000,000  
Fair value of plan assets 1,512,000,000 1,585,000,000  
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 1,820,000,000    
Fair value of plan assets, end of year 1,919,000,000 1,820,000,000  
UNITED STATES | Investments measured at net asset value [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [4] 1,802,000,000    
Fair value of plan assets, end of year [4] 1,883,000,000 1,802,000,000  
UNITED STATES | Cash and Cash Equivalents [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 16,000,000    
Fair value of plan assets, end of year [2] 35,000,000 16,000,000  
UNITED STATES | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 16,000,000    
Fair value of plan assets, end of year [2] 35,000,000 16,000,000  
UNITED STATES | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 0    
Fair value of plan assets, end of year [2] 0 0  
UNITED STATES | Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [2] 0    
Fair value of plan assets, end of year [2] 0 0  
UNITED STATES | United States [Member] | Public Equity Funds [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [5] 2,000,000    
Fair value of plan assets, end of year [5] 1,000,000 2,000,000  
UNITED STATES | United States [Member] | Public Equity Funds [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [5] 2,000,000    
Fair value of plan assets, end of year [5] 1,000,000 2,000,000  
UNITED STATES | United States [Member] | Public Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [5] 0    
Fair value of plan assets, end of year [5] 0 0  
UNITED STATES | United States [Member] | Public Equity Funds [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [5] 0    
Fair value of plan assets, end of year [5] 0 0  
UNITED STATES | Other Alternative Investments [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [6] 0    
Fair value of plan assets, end of year [6] 0 0  
UNITED STATES | Other Alternative Investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [6] 0    
Fair value of plan assets, end of year [6] 0 0  
UNITED STATES | Other Alternative Investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [6] 0    
Fair value of plan assets, end of year [6] 0 0  
UNITED STATES | Other Alternative Investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year [6] 0    
Fair value of plan assets, end of year [6] 0 0  
UNITED STATES | Cash and cash equivalents, public equity, and other investments [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 18,000,000    
Fair value of plan assets, end of year 36,000,000 18,000,000  
UNITED STATES | Cash and cash equivalents, public equity, and other investments [Member] | Fair Value, Inputs, Level 1 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 18,000,000    
Fair value of plan assets, end of year 36,000,000 18,000,000  
UNITED STATES | Cash and cash equivalents, public equity, and other investments [Member] | Fair Value, Inputs, Level 2 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 0    
Fair value of plan assets, end of year 0 0  
UNITED STATES | Cash and cash equivalents, public equity, and other investments [Member] | Fair Value, Inputs, Level 3 [Member]      
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 0    
Fair value of plan assets, end of year $ 0 $ 0  
UNITED STATES | Pension Plan [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]      
Expected Long-Term Rate of Return on Plan Assets 7.37% 7.43%  
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 100.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 100.00% 100.00%  
Change in projected benefit obligation [Roll Forward]      
Benefit obligation, beginning of year $ 1,959,000,000 $ 2,154,000,000  
Service cost 27,000,000 35,000,000 37,000,000
Interest cost 76,000,000 67,000,000 66,000,000
Actuarial (gain) loss 200,000,000 (119,000,000)  
Plan participants' contributions 0 0  
Effect of currency exchange 0 0  
Benefits paid (195,000,000) (178,000,000)  
Benefit obligation, end of year 2,067,000,000 1,959,000,000 2,154,000,000
Change in plan assets [Roll Forward]      
Fair value of plan assets, beginning of year 1,820,000,000 2,054,000,000  
Actual return on plan assets 289,000,000 (61,000,000)  
Effect of currency exchange 0 0  
Company contributions 5,000,000 5,000,000  
Reserve for third party contributions 0 0  
Plan participants' contributions 0 0  
Benefits paid (195,000,000) (178,000,000)  
Fair value of plan assets, end of year 1,919,000,000 1,820,000,000 2,054,000,000
Funded status at end of year (148,000,000) (139,000,000)  
Amounts recognized in the Consolidated Statements of Financial Position consist of [Abstract]      
Other noncurrent asset 13,000,000 2,000,000  
Current liabilities (3,000,000) (4,000,000)  
Post-employment obligations (158,000,000) (137,000,000)  
Net amount recognized, end of year (148,000,000) (139,000,000)  
Accumulated benefit obligation basis for all defined benefit pension plans 2,005,000,000 1,900,000,000  
Amounts recognized in accumulated other comprehensive income consist of [Abstract]      
Prior service (credit) cost 2,000,000 2,000,000  
Components of net periodic benefit cost [Abstract]      
Service cost 27,000,000 35,000,000 37,000,000
Interest cost 76,000,000 67,000,000 66,000,000
Expected return on plan assets (128,000,000) (147,000,000) (140,000,000)
Amortization of: [Abstract]      
Prior service (credit) cost 0 (1,000,000) (4,000,000)
Mark-to-market adjustment 39,000,000 89,000,000 (37,000,000)
Net periodic benefit cost 14,000,000 43,000,000 (78,000,000)
Amortization of: [Abstract]      
Prior service credit 0 (1,000,000) (4,000,000)
Total $ 0 $ (1,000,000) $ (4,000,000)
Weighted-average assumptions used to determine benefit obligations for years ended [Abstract]      
Discount rate (in hundredths) 3.25% 4.29% 3.57%
Rate of compensation increase (in hundredths) 3.25% 3.25% 3.25%
Weighted-average assumptions used to determine net periodic cost for years ended [Abstract]      
Discount rate ( in hundredths) 4.29% 3.57% 3.89%
Discount rate for service costs 4.32% 3.64% 3.89%
Discount rate for interest costs 3.96% 3.18% 3.24%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 7.43% 7.48% 7.49%
Rate of compensation increase (in hundredths) 3.25% 3.25% 3.25%
Estimated future benefits payments [Abstract]      
2020 $ 197,000,000    
2021 161,000,000    
2022 156,000,000    
2023 151,000,000    
2024 151,000,000    
2025-2029 $ 686,000,000    
UNITED STATES | Pension Plan [Member] | Private Equity Securities [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 44.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 50.00% 43.00%  
UNITED STATES | Pension Plan [Member] | Debt Securities [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 39.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 37.00% 44.00%  
UNITED STATES | Pension Plan [Member] | Real Estate [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 2.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) 2.00% 2.00%  
UNITED STATES | Pension Plan [Member] | Other Investment Companies [Member]      
Defined Benefit Plan, Plan Assets, Allocations [Abstract]      
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage [1] 15.00%    
Defined Benefit Plan, Actual Plan Asset Allocations (in hundredths) [1] 11.00% 11.00%  
[1] U.S. primarily consists of private equity and natural resource and energy related limited partnership investments. Non-U.S. primarily consists of annuity contracts and alternative investmen
[2]
Cash & Cash Equivalents: Funds generally invested in actively managed collective trust funds or interest bearing accounts.
[3]
Debt: The fixed income securities are primarily valued upon a market approach, using matrix pricing and considering a security's relationship to other securities for which quoted prices in an active market may be available, or an income approach, converting future cash flows to a single present value amount. Inputs used in developing fair value estimates include reported trades, broker quotes, benchmark yields, and base spreads.
[4]
Investments Measured at Net Asset Value: The underlying debt and public equity investments in this category are generally held in common trust funds, which are either actively or passively managed investment vehicles, that are valued at the net asset value per unit/share multiplied by the number of units/shares held as of the measurement date. The other alternative investments in this category are valued under the practical expedient method which is based on the most recently reported net asset value provided by the management of each private investment fund, adjusted as appropriate, for any lag between the date of the financial reports and the measurement date.
[5]
Public Equity - United States: Common stock equity securities which are primarily valued using a market approach based on the quoted market prices.
[6]
Other Investments: Primarily consist of insurance contracts which are generally valued using a crediting rate that approximates market returns and investments in underlying securities whose market values are unobservable and determined using pricing models, discounted cash flow methodologies, or similar techniques.
[7]
Primarily consists of insurance contracts.