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Commitments and Contingencies - Leases Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]    
Finance lease, interest expense $ 4  
Finance Lease, right-of-use asset, amortization 3  
Finance lease payments 4  
Operating lease, cost 11  
Operating lease, payments 10  
Variable lease, cost 3  
Short-term lease, cost $ 20  
Rental expense   $ 7