Annual report pursuant to Section 13 and 15(d)

Revenues from Contracts with Customers - Schedule of Deferred Revenue Reconciliation (Details)

v3.10.0.1
Revenues from Contracts with Customers - Schedule of Deferred Revenue Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Change In Contract With Customer, Liability [Roll Forward]    
Deferred revenues, beginning of period $ 111 $ 78
Cash received but not yet recognized 116 111
Revenue recognized from prior period deferral (111) 78
Deferred revenues, end of period $ 116 $ 111