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Recent Accounting Pronouncements - Components of Lease Costs (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Leases [Abstract]  
Amortization of right of use assets $ 3
Total Finance Lease Costs 3
Base rent 31
Short-term lease costs 3
Variable lease costs 7
Sublease income (1)
Total Operating Lease Costs $ 40