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 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=64837297&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=64837297&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=66902209&loc=d3e3505-108585

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Derivative Instruments - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Jul. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2017 USD ($) Bcf	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($) Bcf
Derivative [Line Items]
Cash payment for interest-rate swap agreements			$ 125	$ 727
Amount of collateral posted related to derivative instruments with credit-risk-related contingent features		$ 177	177		$ 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)		1,200	1,200		$ 1,400
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Cash payment for interest-rate swap agreements			65	$ 193
Not Designated as Hedging Instrument [Member] \| Interest Rate Swaps 3 and 7 and Portion Of Interest Rate Swap 2 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap		625	625
Not Designated as Hedging Instrument [Member] \| Interest Rate Swaps 3 and 7 and Portion Of Interest Rate Swap 2 [Member] \| Cash Payments To Amend Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Cash payment for interest-rate swap agreements		57
Not Designated as Hedging Instrument [Member] \| Interest-Rate Swap 1 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap		125	125
Not Designated as Hedging Instrument [Member] \| Interest-Rate Swaps 1 Through 7 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap		$ 1,600	$ 1,600
Natural Gas [Member] \| Commodity [Member] \| Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Financial derivative transactions \| Bcf			8		2
Subsequent Event [Member] \| Not Designated as Hedging Instrument [Member] \| Interest-Rate Swap 1 [Member]
Derivative [Line Items]
Notional principal amount of interest-rate swap	$ 125
Subsequent Event [Member] \| Not Designated as Hedging Instrument [Member] \| Interest-Rate Swap 1 [Member] \| Cash Payments To Amend Interest Rate Swap Agreements [Member]
Derivative [Line Items]
Cash payment for interest-rate swap agreements	$ 15