Quarterly report pursuant to Section 13 or 15(d)

Leases - Narrative (Details)

v3.19.1
Leases - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]      
Operating lease assets $ 12    
Operating lease, liability 12    
Finance lease assets 41   $ 41
Finance lease liabilities, noncurrent 59   $ 59
Cash paid included in operating cash flows 2    
Cash paid included in financing activities 1    
Finance lease, amortization 1    
Finance lease, interest expense 1    
Operating lease expense $ 1    
Accounting Standards Update 2016-02      
Lessee, Lease, Description [Line Items]      
Operating lease assets   $ 12  
Operating lease, liability   $ 12