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Supplemental Cash Flow Information - Cash, Cash Equalivalents and Restricted Cash (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]        
Cash and cash equivalents $ 1,525 $ 1,687    
Restricted cash [1] 3 38    
Cash, cash equivalents and restricted cash $ 1,528 $ 1,725 $ 4,995 $ 3,015
[1] The restricted cash balance is included within other current assets on the consolidated balance sheets