Quarterly report pursuant to Section 13 or 15(d)

Leases (Details)

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Leases (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
ft²
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
ft²
Sep. 30, 2017
USD ($)
Capital Leases        
Remainder of 2018 $ 7   $ 7  
2019 27   27  
2020 24   24  
2021 24   24  
2022 22   22  
Thereafter 133   133  
Total 237   237  
Operating leases        
Remainder of 2018 6   6  
2019 21   21  
2020 17   17  
2021 11   11  
2022 9   9  
Thereafter 72   72  
Total $ 136   $ 136  
Capital leased assets, number of units 14   14  
Capital Transponder Monthly Lease Expense $ 1   $ 1  
Capital leases depreciation expense 3 $ 3 11 $ 9
Imputed Interest on Capital Lease 55   55  
Operating leases expense net $ 6 $ 5 $ 18 $ 17
Area of lease (in sqft) | ft² 1,000,000   1,000,000  
Initial term of lease     15 years  
Minimum base rent     $ 6  
Maximum base rent     $ 8  
Number of extension options     2  
Term of lease extensions     10 years  
Amended arrangement initial payment     $ 10  
Amended arrangement annual installment payments     $ 12  
Amended arrangement payment term     13 years  
Build to suit lease, Useful Life     20 years  
ECDC [Member]        
Operating leases        
Area of lease (in sqft) | ft² 1,700,000.0   1,700,000.0  
Lessee, Operating Lease, Term of Contract     15 years  
Operating Leases, Rent Expense, Minimum Rentals     $ 10  
Operating Leases, Rent Expense, Minimum Rentals, Final Year     $ 14  
Lessee Leasing Arrangements, Operating Lease, Number of Five Year Extension Options     2  
Lessee, Operating Lease, Renewal Term     5 years  
Lessee Leasing Arrangements, Operating Lease, Number of Four Year Extension Options     1  
Lessee, Operating Lease, Final Renewal Term     4 years