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Leases - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jan. 01, 2019
Lessee, Lease, Description [Line Items]          
Lease assets $ 148   $ 148    
Lease liabilities 150   150    
Lease income $ 16 $ 9 $ 30 $ 19  
Minimum          
Lessee, Lease, Description [Line Items]          
Operating lease, term of contract 2 years   2 years    
Maximum          
Lessee, Lease, Description [Line Items]          
Operating lease, term of contract 10 years   10 years    
Accounting Standards Update 2016-02          
Lessee, Lease, Description [Line Items]          
Lease assets         $ 68
Lease liabilities         $ 66