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Stock-Based Compensation Restricted Stock Units and Performance Deferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSU and PSU Award Vesting Period 3 years      
Remaining Weighted-Average Recognition Period 6 months 21 days      
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation arrangement by share based payment award, equity instruments other than options, actual awards granted, percentage of performance target 0.00%      
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based compensation arrangement by share based payment award, equity instruments other than options, actual awards granted, percentage of performance target 200.00%      
RSUs and PSUs - OIP [Domain]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Grant Date Fair Value, RSUs and PSUs granted during the period $ 31.15 $ 28.88    
Fair Value of RSUs and PSUs vested during the period $ 49 $ 19    
Unrecognized Pretax Compensation Expense Related to RSUs and PSUs       $ 56
Remaining Weighted-Average Recognition Period 8 months 1 day      
RSUs and PSUs - EIP [Domain]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted Average Grant Date Fair Value, RSUs and PSUs granted during the period   $ 52.19 $ 70.37  
Fair Value of RSUs and PSUs vested during the period   $ 79 $ 128  
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity award conversion ratio 1      
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSU Requisite Service Period 6 months      
Restricted Stock Units and Performance Deferred Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Nonvested RSUs and PSUs at beginning of period 5,438,000      
RSUs and PSUs granted during the period 1,970,000      
RSUs and PSUs vested during the period (1,400,000)      
RSUs and PSUs forfeited during the period (125,000)      
Nonvested RSUs and PSUs at end of period 5,883,000 5,438,000    
Weighted average grant date fair value, nonvested RSUs and PSUs beginning of period $ 32.49      
Weighted Average Grant Date Fair Value, RSUs and PSUs granted during the period 31.15      
Weighted Average Grant Date Fair Value, vested RSUs and PSUs during the period 34.69      
Weighted Average Grant Date Fair Value, RSUs and PSUs forfeited during the period 31.16      
Weighted average grant date fair value, nonvested RSUs and PSUs end of period $ 32.49 $ 32.49   $ 31.54
Performance Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSUs and PSUs granted during the period 444,816      
Weighted Average Grant Date Fair Value, RSUs and PSUs granted during the period $ 31.17      
Minimum [Member] | Management [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSU and PSU Award Vesting Period 3 years      
Maximum [Member] | Management [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSU and PSU Award Vesting Period 5 years      
OIP [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSU and PSU Award Vesting Period 3 years      
EIP [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSU and PSU Award Vesting Period 3 years      
Dow [Member] | Minimum [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSU and PSU Award Vesting Period 1 year      
Dow [Member] | Maximum [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
RSU and PSU Award Vesting Period 3 years