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Supplemental Cash Flow Information - Change in Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 2 $ 5    
Restricted cash [1] 4 4    
Cash, cash equivalents and restricted cash $ 6 [2] $ 9 [2] $ 268 $ 239
[1] The restricted cash balance is included within “Other current assets” on the Consolidated Balance Sheets.
[2] As a result of the adoption of ASU 2016-18, the Consolidated Statements of Cash Flows now explain the change during the period of both “Cash and cash equivalents” and “Restricted cash.”