Annual report pursuant to Section 13 and 15(d)

Leases (Details)

v3.10.0.1
Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Leased Assets [Line Items]      
Operating Leases, Rent Expense $ 16 $ 13 $ 11
2019 [1] 10    
2020 [1] 10    
2021 [1] 10    
2022 [1] 10    
2023 [1] 10    
Thereafter [1] 124    
Total [1] $ 174    
Maximum [Member]      
Operating Leased Assets [Line Items]      
Property Lease Term 30 years    
Lessee, Operating Lease, Renewal Term 60 years    
[1] Includes certain lease option renewals that are reasonably assured and payments for certain non-lease components.