SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details) $ in Millions	Dec. 31, 2017 USD ($)
Previously stated
Disclosure of initial application of standards or interpretations [line items]
Equity	$ (79,872)
Accounts receivable	(11,973)
Inventory	6,311
Increase (decrease) due to application of IFRS 15 [member]
Disclosure of initial application of standards or interpretations [line items]
Equity	280
Accounts receivable	368
Inventory	258
Increase (decrease) due to application of IFRS 15 [member] \| Private Equity
Disclosure of initial application of standards or interpretations [line items]
Equity	265
Work in progress liability	120
Accounts receivable	125
Increase (decrease) due to application of IFRS 15 [member] \| Residential
Disclosure of initial application of standards or interpretations [line items]
Equity	15
Deferred revenue	90
Accounts receivable	190
Inventory	$ 250

The amount of advances received by the entity before the related work is performed on construction contracts.

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