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Fair Value Measurements, Guarantees, and Concentration of Credit Risk (Tables)
 12 Months Ended
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Assets and Liabilities Measured On Recurring Basis [Table Text Block]
The following table presents, by level within the fair value hierarchy, certain of our financial assets and liabilities. The carrying values of cash and cash equivalents, accounts receivable, commercial paper, and accounts payable approximate fair value because of the short-term nature of these instruments. Therefore, these assets and liabilities are not presented in the following table.
 
 
 
 
 
Fair Value Measurements Using
 
Carrying
Amount
 
Fair
Value
 
Quoted
Prices In
Active
Markets for
Identical
Assets
(Level 1)
 
Significant
Other
Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
 
(Millions)
Assets (liabilities) at December 31, 2015:
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
ARO Trust investments
$
67

 
$
67

 
$
67

 
$
—

 
$
—

Energy derivatives assets not designated as hedging instruments
5

 
5

 
—

 
3

 
2

Energy derivatives liabilities not designated as hedging instruments
(2
)
 
(2
)
 
—

 
—

 
(2
)
Additional disclosures:
 
 
 
 
 
 
 
 
 
Notes receivable and other
12

 
30

 
10

 
2

 
18

Long-term debt, including current portion (1)
(23,987
)
 
(19,606
)
 
—

 
(19,606
)
 
—

Guarantee
(29
)
 
(16
)
 
—

 
(16
)
 
—

Assets (liabilities) at December 31, 2014:
 
 
 
 
 
 
 
 
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
ARO Trust investments
$
48

 
$
48

 
$
48

 
$
—

 
$
—

Energy derivatives assets not designated as hedging instruments
3

 
3

 
1

 
—

 
2

Energy derivatives liabilities not designated as hedging instruments
(2
)
 
(2
)
 
—

 
—

 
(2
)
Additional disclosures:
 
 
 
 
 
 
 
 
 
Notes receivable and other
30

 
57

 
—

 
4

 
53

Long-term debt, including current portion (1)
(20,779
)
 
(21,131
)
 
—

 
(21,131
)
 
—

Guarantee
(31
)
 
(27
)
 
—

 
(27
)
 
—

___________
(1)
Excludes capital leases. The carrying value has been reduced by $123 million and $108 million of debt acquisition costs at December 31, 2015 and 2014, respectively. (See Note 14 – Debt, Banking Arrangements, and Leases.)
Concentration of receivables, net of allowances, by product or service [Table Text Block]
The following table summarizes concentration of receivables, net of allowances.
 
December 31,
 
2015
 
2014
 
(Millions)
NGLs, natural gas, and related products and services
$
823

 
$
730

Transportation of natural gas and related products
202

 
175

Income tax receivable
7

 
167

Other
9

 
67

Total
$
1,041

 
$
1,139
Property, Plant and Equipment [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurements, Nonrecurring [Table Text Block]
 
 
 
 
 
Impairments
 
 
 
 
 
Years Ended December 31,
 
Date of Measurement
 
Fair Value
 
2015
 
2014
 
 
 
(Millions)
Impairment of certain assets (1)
June 30, 2014
 
$
46

 
 
 
$
17

Impairment of certain assets (1)
December 31, 2014
 
32

 
 
 
13

Impairment of certain assets (1)
June 30, 2015
 
17

 
$
20

 
 
Impairment of certain assets (2)
December 31, 2014
 
1

 
 
 
12

Impairment of certain assets (3)
December 31, 2015
 
13

 
94

 
 
Impairment of certain assets (4)
December 31, 2015
 
40

 
64

 
 
Level 3 fair value measurements of certain assets
 
 
 
 
178

 
42

Other impairments (5)
 
 
 
 
31

 
10

Total impairments of certain assets
 
 
 
 
$
209

 
$
52

______________
(1)
Reflects impairment charges for our Williams Partners segment associated with certain surplus equipment. Certain of these assets were previously presented as held for sale, but are now considered held for use and reported in Property, plant, and equipment – net in the Consolidated Balance Sheet at December 31, 2015. The estimated fair value was determined by a market approach based on our analysis of observable inputs in the principal market. These impairment charges are recorded in Other (income) expense – net within Costs and expenses in the Consolidated Statement of Operations.

(2)
Reflects impairment charges for our Williams Partners segment associated with certain surplus equipment considered held for sale and reported in Other current assets and deferred charges in the Consolidated Balance Sheet. The estimated fair value was determined by a market approach based on our analysis of observable inputs in the principal market. These impairment charges are recorded in Other (income) expense – net within Costs and expenses in the Consolidated Statement of Operations.

(3)
Reflects an impairment charge within our Williams Partners segment associated with previously capitalized project development costs for a gas processing plant, the completion of which is now considered remote due to unfavorable impact of low natural gas prices on customer drilling activities. These impairment charges are recorded in Other (income) expense – net within Costs and expenses in the Consolidated Statement of Operations.The assessed fair value primarily represents the estimated salvage value of certain equipment measured using a market approach based on our analysis of observable inputs in the principal market and is reported in Property, plant, and equipment – net in the Consolidated Balance Sheet.

(4)
Reflects an impairment charge within our Williams NGL & Petchem Services segment associated with previously capitalized project development costs for an olefins pipeline project, the completion of which is now considered remote due to the lack of customer interest. These impairment charges are recorded in Other (income) expense – net within Costs and expenses in the Consolidated Statement of Operations. The assessed fair value primarily represents the estimated value of unused pipeline measured using a market approach based on our analysis of observable inputs in the principal market and is reported in Property, plant, and equipment – net in the Consolidated Balance Sheet.

(5)
Reflects multiple individually insignificant impairments of other certain assets that may no longer be in use or are surplus in nature for which the fair value was determined to be zero or an insignificant salvage value. These impairment charges are recorded in Other (income) expense – net within Costs and expenses in the Consolidated Statement of Operations
Investments [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value Measurements, Nonrecurring [Table Text Block]
 
Date of Measurement
 
Fair Value
 
Impairments
 
 
 
(Millions)
Impairments of equity-method investments (1)
September 30, 2015
 
$
1,203

 
$
461

Impairments of equity-method investments (2)
December 31, 2015
 
4,017

 
890

Other impairment of equity-method investment
December 31, 2015
 
58

 
8

Level 3 fair value measurements of equity-method investments
 
 
 
 
$
1,359

______________
(1)
Reflects other-than-temporary impairment charges related to Williams Partners’ equity-method investments in the Delaware basin gas gathering system and certain of the Appalachia Midstream Investments reflected within Impairment of equity-method investments in the Consolidated Statement of Operations. The historical carrying value of these investments was initially recorded based on estimated fair value during the third quarter of 2014 in conjunction with the ACMP Acquisition. We estimated the fair value of these investments using an income approach based on expected future cash flows and appropriate discount rates. The determination of estimated future cash flows involved significant assumptions regarding gathering volumes and related capital spending. Discount rates utilized were 11.8 percent and 8.8 percent for the Delaware basin gas gathering system and certain of the Appalachia Midstream Investments, respectively, and reflected our cost of capital as impacted by market conditions, and risks associated with the underlying businesses.

(2)
Reflects other-than-temporary impairment charges related to Williams Partners’ equity-method investments in the Delaware basin gas gathering system, certain of the Appalachia Midstream Investments, UEOM, and Laurel Mountain, reflected within Impairment of equity-method investments in the Consolidated Statement of Operations. We estimated the fair value of these investments using an income approach based on expected future cash flows and appropriate discount rates. The determination of estimated future cash flows involved significant assumptions regarding gathering volumes and related capital spending. Discount rates utilized ranged from 10.8 percent to 14.4 percent and reflected further fourth quarter increases in our cost of capital, revised estimates of expected future cash flows, and risks associated with the underlying businesses.