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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |
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Jun. 30, 2019 | Jan. 01, 2019
Lessee, Lease, Description [Line Items] |  |
Period for probable revenue recovery | 24 months |
Cash payments arising from operating leases | $ 848 |
ROU assets | 2,662 |
Lease liabilities | $ 2,653 |
Weighted average remaining lease term | 6 years 1 month 13 days |
Weighted average discount rate | 6.10% |
Minimum |  |
Lessee, Lease, Description [Line Items] |  |
Power purchase agreement, term | 5 years |
Maximum |  |
Lessee, Lease, Description [Line Items] |  |
Power purchase agreement, term | 20 years |
Accounting Standards Update 2016-02 |  |
Lessee, Lease, Description [Line Items] |  |
ROU assets |  | $ 2,800
Lease liabilities |  | $ 2,800

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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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