Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959

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- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

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- Definition

The cash outflow for derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3505-108585

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Derivative Instruments - Additional Information (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) Bcf	Dec. 31, 2016 USD ($) Bcf	Dec. 31, 2015 USD ($)
Derivative [Line Items]
Total cash payments for settled interest-rate swaps		$ 165	$ 333	$ 35
Additional collateral that would be required if company credit rating were downgraded		50
Amount of collateral posted related to derivative instruments with credit-risk-related contingent features		170	117
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Aggregate fair value of derivative instruments with credit-risk-related contingent features for which a net liability position existed, net of collateral		1,400	1,400
Not Designated as Hedging Instrument [Member] \| Cash Payments Related To Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Total cash payments for settled interest-rate swaps		112	274
Not Designated as Hedging Instrument [Member] \| Interest Rate Swaps 1 And 3 [Member] \| Modified Interest Rate Swap for Mandatory Termination Dates [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap			$ 500
Not Designated as Hedging Instrument [Member] \| Interest Rate Swaps 1, 3 and 7 and Portion of Interest Rate Swap 2 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	$ 750
Not Designated as Hedging Instrument [Member] \| Interest Rate Swaps 1, 3 and 7 and Portion of Interest Rate Swap 2 [Member] \| Cash Payments To Amend Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Total cash payments for settled interest-rate swaps	$ 72
Not Designated as Hedging Instrument [Member] \| Interest Rate Swaps 1 Through 6 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap		$ 1,600
Commodity [Member] \| Natural Gas [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Financial derivative transactions \| Bcf		17	2