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Commitments and Guarantees (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |
percentage of output |  | 25.00% |  |
Capital Leased Assets, Gross |  | $ 57 |  |
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation |  | 6 |  |
Capital Lease Obligations, Current |  | 2 |  |
Purchase Commitment, Remaining Minimum Amount Committed |  | 49 |  |
Deferred Costs, Leasing, Accumulated Amortization | $ 2 | 3 | $ 1 |
Interest Expense, Lessee, Assets under Capital Lease | $ 3 | 4 | 2 |
Long-term Purchase Commitment, Amount |  | 132 |  |
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress |  | 12 |  |
Operating Leases, Rent Expense |  | 9 | 10 | $ 0
Operating Leases, Future Minimum Payments Receivable, in Two Years |  | 3 |  |
Operating Leases, Future Minimum Payments, Due in Three Years |  | 3 |  |
Operating Leases, Future Minimum Payments Receivable, in Five Years |  | 2 |  |
Contractual Obligation |  | 318 |  |
Operating Leases, Rent Expense, Sublease Rentals |  | 4 | 4 | $ 3
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Three Years |  | 3 |  |
Capital Addition Purchase Commitments [Member] |  |  |  |
Unrecorded Unconditional Purchase Obligation [Line Items] |  |  |  |
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress |  | $ 108 | $ 21 |

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- Definition Amount of capital lease obligation due within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45023-112735 + Details
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- Definition Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 + Details
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- Definition The total charge for the use of long-lived depreciable assets subject to a lease meeting the criteria for capitalization. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 2) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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- Definition For an unclassified balance sheet, the accumulated amortization, as of the reporting date, which represents the periodic charge to earnings of initial direct costs which have been deferred and are being allocated over the lease term in proportion to the recognition of rental income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=77902619&loc=d3e40588-112709 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77913719&loc=d3e40879-112712 + Details
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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 360 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -URI http://asc.fasb.org/extlink&oid=6500719&loc=d3e659983-123033 + Details
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