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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
The following table presents the financial instruments carried at fair value classified by the valuation hierarchy:
 
June 30, 2017
 
December 31, 2016
(In millions)
Assets
 
Liabilities
 
Assets
 
Liabilities
Significant other observable inputs (Level 2)
 
 
 
 
 
 
 
Commodity contracts
$
—

 
$
—

 
$
—

 
$
—

Significant unobservable inputs (Level 3)
 
 
 
 
 
 
 
Commodity contracts
2

 
—

 
—

 
(6
)
Embedded derivatives in commodity contracts
—

 
(43
)
 
—

 
(54
)
Total carrying value in Consolidated Balance Sheets
$
2

 
$
(43
)
 
$
—

 
$
(60
)
Fair Value Inputs Assets and Liabilities Quantitative Information [Table Text Block]
The following table provides additional information about the significant unobservable inputs used in the valuation of Level 3 instruments as of June 30, 2017. The market approach is used for valuation of all instruments.
Level 3 Instrument
 
Balance Sheet Classification
 
Unobservable Inputs
 
Value Range
 
Time Period
Commodity contracts
 
Assets
 
Forward ethane prices (per gallon)(1)
 
$0.25 - $0.26
 
July 17 - Dec. 17
 
 
 
 
Forward propane prices (per gallon)(1)
 
$0.53 - $0.63
 
July 17 - Dec. 18
 
 
 
 
Forward isobutane prices (per gallon)(1)
 
$0.66 - $0.76
 
July 17 - Dec. 18
 
 
 
 
Forward normal butane prices (per gallon)(1)
 
$0.59 - $0.74
 
July 17 - Dec. 18
 
 
 
 
Forward natural gasoline prices (per gallon)(1)
 
$1.03 - $1.06
 
July 17 - Dec. 18
 
 
 
 
 
 
 
 
 
Embedded derivatives in commodity contracts
 
Assets
 
ERCOT Pricing (per MegaWatt Hour)
 
$24.62 - $45.42
 
July 17 - Dec. 17
 
 
Liabilities
 
Forward propane prices (per gallon)(1)
 
$0.52 - $0.63
 
July 17 - Dec. 22
 
 
 
 
Forward isobutane prices (per gallon)(1)
 
$0.64 - $0.76
 
July 17 - Dec. 22
 
 
 
 
Forward normal butane prices (per gallon)(1)
 
$0.59 - $0.74
 
July 17 - Dec. 22
 
 
 
 
Forward natural gasoline prices (per gallon)(1)
 
$1.03 - $1.10
 
July 17 - Dec. 22
 
 
 
 
Forward natural gas prices (per MMBtu)(2)
 
$2.26 - $3.14
 
July 17 - Dec. 22
 
 
 
 
Probability of renewal(3)
 
50.0%
 
 
 
 
 
 
Probability of renewal for second 5-yr term(3)
 
75.0%
 
 

(1)
NGL prices used in the valuations decrease in the early years and increase over time.
(2)
Natural gas prices used in the valuations decrease in the early years and increase over time.
(3)
The producer counterparty to the embedded derivative has the option to renew the gas purchase agreement and the related keep-whole processing agreement for two successive five-year terms after 2022. The embedded gas purchase agreement cannot be renewed without the renewal of the related keep-whole processing agreement. Due to the significant number of years until the renewal options are exercisable and the high level of uncertainty regarding the counterparty’s future business strategy, the future commodity price environment, and the future competitive environment for midstream services in the Southern Appalachian region, management determined that a 50 percent probability of renewal for the first five-year term and 75 percent for the second five-year term are appropriate assumptions. Included in this assumption is a further extension of management’s estimates of future frac spreads through 2032.
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The tables below include a rollforward of the balance sheet amounts for the three and six months ended June 30, 2017 and 2016, respectively (including the change in fair value), for assets and liabilities classified by the Partnership within Level 3 of the valuation hierarchy.
 
Three Months Ended June 30, 2017
 
Six Months Ended June 30, 2017
(In millions)
Commodity Derivative Contracts (net)
 
Embedded Derivatives in Commodity Contracts (net)
 
Commodity Derivative Contracts (net)
 
Embedded Derivatives in Commodity Contracts (net)
Fair value at beginning of period
$
—

 
$
(44
)
 
$
(6
)
 
$
(54
)
Total gains (realized and unrealized) included in earnings(1)
2

 
—

 
7

 
8

Settlements
—

 
1

 
1

 
3

Fair value at end of period
$
2

 
$
(43
)
 
$
2

 
$
(43
)
The amount of total gains (losses) for the period included in earnings attributable to the change in unrealized losses relating to liabilities still held at end of period
$
2

 
$
(1
)
 
$
5

 
$
7


 
Three Months Ended June 30, 2016
 
Six Months Ended June 30, 2016
(In millions)
Commodity Derivative Contracts (net)
 
Embedded Derivatives in Commodity Contracts (net)
 
Commodity Derivative Contracts (net)
 
Embedded Derivatives in Commodity Contracts (net)
Fair value at beginning of period
$
—

 
$
(34
)
 
$
7

 
$
(32
)
Total (losses) (realized and unrealized) included in earnings(1)
(6
)
 
(7
)
 
(7
)
 
(11
)
Settlements
1

 
1

 
(5
)
 
3

Netting adjustment(2)
1

 
—

 
1

 
—

Fair value at end of period
$
(4
)
 
$
(40
)
 
$
(4
)
 
$
(40
)
The amount of total losses for the period included in earnings attributable to the change in unrealized losses relating to liabilities still held at end of period
$
(5
)
 
$
(8
)
 
$
(6
)
 
$
(11
)

(1)
Gains and losses on Commodity Derivative Contracts classified as Level 3 are recorded in Product sales in the accompanying Consolidated Statements of Income. Gains and losses on Embedded Derivatives in Commodity Contracts are recorded in Purchased product costs and Cost of Revenues.
(2)
Certain derivative positions are subject to master netting agreements; therefore, the Partnership has elected to offset derivative assets and liabilities where legally permissible. The Partnership may hold positions with certain counterparties, which for GAAP purposes are classified within different levels of the fair value hierarchy and may be legally permissible to offset. This adjustment represents the total impact of offsetting Level 2 positions with Level 3 positions as of June 30, 2016.
Fair Value Carrying Value by Balance Sheet Grouping [Table Text Block]
The following table summarizes the fair value and carrying value of the long-term debt, excluding capital leases, and SMR liability:
 
June 30, 2017
 
December 31, 2016
(In millions)
Fair Value
 
Carrying Value
 
Fair Value
 
Carrying Value
Long-term debt
$
7,362

 
$
6,687

 
$
4,953

 
$
4,422

SMR liability
106

 
93

 
108

 
96