Investing Activities Investing Activities	9 Months Ended
Sep. 30, 2015
Investing Activities [Abstract]
Investment [Text Block]	Note 4 – Investing Activities Investing Income During the third quarter of 2015, we recognized other-than-temporary pre-tax impairment charges of $458 million and $3 million related to WPZ’s equity-method investments in the Delaware basin gas gathering system and certain of the Appalachia Midstream Investments, respectively (see Note 12 – Fair Value Measurements and Guarantees.) We also recognized a loss of $16 million within Equity earnings (losses) in the Consolidated Statement of Operations associated with our share of underlying property impairments at certain of the Appalachia Midstream Investments. These items are reported within the Williams Partners segment. Gain on remeasurement of equity-method investment Gain on remeasurement of equity-method investment of $2.522 billion for the three and nine months ended September 30, 2014, is a result of remeasuring our equity-method investment in ACMP to a preliminary acquisition-date fair value of $4.6 billion when we obtained control and consolidated ACMP following the ACMP Acquisition. Equity earnings (losses) Equity earnings (losses) for the three and nine months ended September 30, 2014, include $19 million of equity losses associated with our share of certain compensation-related costs at ACMP that were triggered by the ACMP Acquisition. Equity earnings (losses) for the nine months ended September 30, 2014, include $70 million of losses reported within Williams NGL & Petchem Services related to the write-off of previously capitalized project development costs by Bluegrass Pipeline, Moss Lake Fractionation LLC, and Moss Lake LPG Terminal LLC after our management decided to discontinue further funding of the projects. These entities were dissolved in the fourth quarter of 2014. Interest income and other The three and nine months ended September 30, 2015, include $18 million and $27 million, respectively, and the three and nine months ended September 30, 2014, include $14 million and $41 million, respectively, of interest income associated with a receivable related to the sale of certain former Venezuela assets reflected in Other investing income (loss) – net in the Consolidated Statement of Operations. Due to changes in circumstances that led to late payments and increased uncertainty regarding the recovery of the receivable, we began accounting for the receivable under a cost recovery model in first quarter 2015. Subsequently, we received payments greater than the remaining carrying amount of the receivable, which resulted in the recognition of interest income. Investments Accrued liabilities in the Consolidated Balance Sheet reflects a special distribution WPZ received on September 24, 2015, of $396 million from Gulfstream related to WPZ’s proportional share of proceeds from new debt issued by Gulfstream. The new debt was issued to refinance Gulfstream’s current debt maturities and WPZ will contribute its proportional share of amounts necessary to fund those current debt maturities when due.

Note 4 – Investing Activities

Investing Income

During the third quarter of 2015, we recognized other-than-temporary pre-tax impairment charges of $458 million and $3 million related to WPZ’s equity-method investments in the Delaware basin gas gathering system and certain of the Appalachia Midstream Investments, respectively (see Note 12 – Fair Value Measurements and Guarantees.) We also recognized a loss of $16 million within Equity earnings (losses) in the Consolidated Statement of Operations associated with our share of underlying property impairments at certain of the Appalachia Midstream Investments. These items are reported within the Williams Partners segment.

Gain on remeasurement of equity-method investment

Gain on remeasurement of equity-method investment of $2.522 billion for the three and nine months ended September 30, 2014, is a result of remeasuring our equity-method investment in ACMP to a preliminary acquisition-date fair value of $4.6 billion when we obtained control and consolidated ACMP following the ACMP Acquisition.

Equity earnings (losses)

Equity earnings (losses) for the three and nine months ended September 30, 2014, include $19 million of equity losses associated with our share of certain compensation-related costs at ACMP that were triggered by the ACMP Acquisition.

Equity earnings (losses) for the nine months ended September 30, 2014, include $70 million of losses reported within Williams NGL & Petchem Services related to the write-off of previously capitalized project development costs by Bluegrass Pipeline, Moss Lake Fractionation LLC, and Moss Lake LPG Terminal LLC after our management decided to discontinue further funding of the projects. These entities were dissolved in the fourth quarter of 2014.

Interest income and other

The three and nine months ended September 30, 2015, include $18 million and $27 million, respectively, and the three and nine months ended September 30, 2014, include $14 million and $41 million, respectively, of interest income associated with a receivable related to the sale of certain former Venezuela assets reflected in Other investing income (loss) – net in the Consolidated Statement of Operations. Due to changes in circumstances that led to late payments and increased uncertainty regarding the recovery of the receivable, we began accounting for the receivable under a cost recovery model in first quarter 2015. Subsequently, we received payments greater than the remaining carrying amount of the receivable, which resulted in the recognition of interest income.

Investments

Accrued liabilities in the Consolidated Balance Sheet reflects a special distribution WPZ received on September 24, 2015, of $396 million from Gulfstream related to WPZ’s proportional share of proceeds from new debt issued by Gulfstream. The new debt was issued to refinance Gulfstream’s current debt maturities and WPZ will contribute its proportional share of amounts necessary to fund those current debt maturities when due.