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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Statement of Cash Flows [Abstract]    
Cash and cash equivalents $ 882 $ 1,089
Restricted cash 1 0
Total cash, cash equivalents and restricted cash $ 883 $ 1,089