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Incentive Compensation / 401(k) Retirement Plan - Performance Share Units Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognition period of fair value as compensation cost 1 year    
Performance Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards outstanding (in shares) 1,478,100    
Shares issuable upon conversion (in shares) 1    
Performance period 4 years    
Vesting period 3 years    
Shares subject to certain settlement and transfer restrictions (in shares) 1,224,000    
Grant date fair value of awards   $ 5 $ 12
Unrecognized compensation cost $ 6    
Recognition period of fair value as compensation cost 2 years