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Redeemable Noncontrolling Interests - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 08, 2018
Jun. 22, 2018
Feb. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]          
Initial fair value of redeemable noncontrolling interests of acquired businesses       $ 102 $ 44
Payments to acquire redeemable noncontrolling interests       43  
Adjustment to redemption value       $ 6
TM4 [Member]          
Business Acquisition [Line Items]          
Initial fair value of redeemable noncontrolling interests of acquired businesses   $ 102      
TM4 [Member] | Hydro-Quebec [Member]          
Business Acquisition [Line Items]          
Ownership percentage by noncontrolling owners   45.00%      
BFP and BPT [Member]          
Business Acquisition [Line Items]          
Initial fair value of redeemable noncontrolling interests of acquired businesses     $ 44    
Payments to acquire redeemable noncontrolling interests $ 43        
Received in settlement of all pending and future claims $ 10        
BFP and BPT [Member] | Brevini Group S.p.A. [Member]          
Business Acquisition [Line Items]          
Ownership percentage by noncontrolling owners     20.00%