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Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | $ 764 | $ 779 |
Other intangible assets not subject to amortization, primarily land easements | 138 | 143 |
Other intangible assets: |  |  |
Total | 1,300 | 1,225 |
Accumulated amortization | (151) | (115) |
Total other intangible assets subject to amortization - net | 1,149 | 1,110 |
Intangible assets, amortization [Abstract] |  |  |
Amortization expense | 35 | 35 | $ 17
Amortization Expense 2017 | 36 |  |
Amortization Expense 2018 | 35 |  |
Amortization Expense 2019 | 35 |  |
Amortization Expense 2020 | 35 |  |
Amortization Expense 2021 | $ 35 |  |
Customer relationships associated with gas infrastructure [Member] |  |  |
Other intangible assets: |  |  |
Weighted average useful lives (years) | 41 years |  |
Total | $ 700 | 700 |
Purchased Power Agreements [Member] |  |  |
Other intangible assets: |  |  |
Weighted average useful lives (years) | 22 years |  |
Total | $ 521 | 444 |
Other, primarily transmission and development rights and customer lists [Member] |  |  |
Other intangible assets: |  |  |
Weighted average useful lives (years) | 23 years |  |
Total | $ 79 | 81 |
Gas Infrastructure, primarily Texas pipelines [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 641 | 641 |
Customer Supply [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 72 | 72 |
Generation Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 40 | 38 |
Other Goodwill Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | $ 11 | $ 28 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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