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Leases (Details 2)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Operating leases, weighted-average remaining lease terms 8 years 8 months 16 days
Finance leases, weighted-average remaining lease terms 4 years 10 months 21 days
Operating leases, weighted-average discount rate 4.96%
Finance leases, weighted-average discount rate 3.44%
Operating lease assets, net of accumulated amortization of $5 million $ 187
Finance lease assets, net of accumulated amortization of $87 million 77
Leased Asset 264
Operating liability, current 29
Finance liability, current 16
Operating liability, noncurrent 190
Finance liability, noncurrent 55
Total leased liabilities 290
Operating lease assets, accumulated amortization 5
Financing lease, accumulated amortization 87
Operating cash flows from operating leases 8
Operating cash flows from finance leases 1
Finance cash flows from finance leases 4
Operating leases 6
Finance leases $ 1