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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
 
March 31, 2018
 
December 31, 2017
(In millions)
Assets
 
Liabilities
 
Assets
 
Liabilities
Significant unobservable inputs (Level 3)
 
 
 
 
 
 
 
Commodity contracts
$
—

 
$
(1
)
 
$
—

 
$
(2
)
Embedded derivatives in commodity contracts
—

 
(59
)
 
—

 
(64
)
Total carrying value in Consolidated Balance Sheets
$
—

 
$
(60
)
 
$
—

 
$
(66
)
Fair Value Inputs Assets and Liabilities Quantitative Information [Table Text Block]
Level 3 instruments include all NGL transactions and embedded derivatives in commodity contracts. The embedded derivative liability relates to a natural gas purchase agreement embedded in a keep-whole processing agreement. The fair value calculation for these Level 3 instruments used significant unobservable inputs including: (1) NGL prices interpolated and extrapolated due to inactive markets ranging from $0.26 to $1.47 and (2) the probability of renewal of 62.50 percent for the first five year term and 82 percent for the second five year term of the gas purchase agreement and related keep-whole processing agreement. For these contracts, increases in forward NGL prices result in a decrease in the fair value of the derivative assets and an increase in the fair value of derivative liabilities. The forward prices for NGL products generally increase or decrease in positive correlation with one another. Increases or decreases in forward NGL prices result in an increase or decrease in the fair value of the embedded derivative. Increases or decreases in the frac spread result in an increase or decrease in the fair value of the embedded derivative liability. An increase in the probability of renewal would result in an increase in the fair value of the related embedded derivative liability.
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The following table is a reconciliation of the net beginning and ending balances recorded for net assets and liabilities classified as Level 3 in the fair value hierarchy.
 
Three Months Ended March 31, 2018
 
Three Months Ended March 31, 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
$
(2
)
 
$
(64
)
 
$
(6
)
 
$
(54
)
Total gains (losses) (realized and unrealized) included in earnings(1)
—

 
3

 
5

 
8

Settlements
—

 
3

 
1

 
2

Fair value at end of period
$
(2
)
 
$
(58
)
 
$
—

 
$
(44
)
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
$
—

 
$
3

 
$
5

 
$
8


(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 derivatives embedded in commodity contracts are recorded in “Purchased product costs” and “Cost of revenues.”
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:
 
March 31, 2018
 
December 31, 2017
(In millions)
Fair Value
 
Carrying Value
 
Fair Value
 
Carrying Value
Long-term debt
$
12,442

 
$
11,934

 
$
7,718

 
$
6,966

SMR liability
100

 
90

 
104

 
91