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Redeemable Noncontrolling Interests - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Aug. 08, 2018
Jun. 22, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Feb. 01, 2017
Business Acquisition [Line Items]              
Initial fair value of redeemable noncontrolling interests of acquired businesses     $ 102 $ 102  
TM4 [Member]              
Business Acquisition [Line Items]              
Initial fair value of redeemable noncontrolling interests of acquired businesses   $ 102          
BFP and BPT [Member]              
Business Acquisition [Line Items]              
Payments to acquire redeemable noncontrolling interests $ 43            
Received in settlement of all pending and future claims $ 10            
Hydro-Quebec [Member] | TM4 [Member]              
Business Acquisition [Line Items]              
Ownership percentage by noncontrolling owners   45.00%          
Brevini Group S.p.A. [Member] | BFP and BPT [Member]              
Business Acquisition [Line Items]              
Ownership percentage by noncontrolling owners             20.00%