Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Performance Bonds and Parent Guarantees (Detail)

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Commitments and Contingencies - Performance Bonds and Parent Guarantees (Detail) - Performance Bonds
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
Guarantor Obligations [Line Items]  
Total amount of outstanding performance bonds $ 3,500
Estimate  
Guarantor Obligations [Line Items]  
Estimated cost to complete bonded projects $ 840