2.2.0.7 false Partners' Capital 0205 - Disclosure - Partners' Capital true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 EPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Partners merger units issuance abstract 0 wpz_PartnersMergerUnitsIssuanceAbstract wpz false na duration No definition available. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 3 Partners merger units issuance text block 1 wpz_PartnersMergerUnitsIssuanceTextBlock wpz false na duration Footnote containing information related to the merger of WPZ and WMZ. In addition, it contains information related to an... false false false false false false false false false false false false 1 false false false false 0 0 Note 5. Partners' Capital On August 31, 2010, the WMZ unitholders approved the merger between WMZ and us (see Note 1). As a result of the merger, effective September 1, 2010, WMZ unitholders, other than its general partner, received 0.7584 WPZ common units for each WMZ common unit they owned at the effective time of the merger, for a total issuance of 13,580,485 common units.  On September 28, 2010, we completed an equity issuance of 9,250,000 common units representing limited partner interests in us at a price of $42.40 per unit. The proceeds of approximately $380 million, net of the underwriters' discount and fees of approximately $12 million were used to repay borrowings incurred to fund a portion of our additional $424 million investment in OPPL. This additional investment increases our ownership interest in OPPL to 50 percent, which is included in our Midstream segment and is accounted for using the equity method of accounting. On October 8, 2010, we sold an additional 1,387,500 common units to the underwriters upon the underwriters' exercise of their option to purchase additional common units pursuant to our common unit offering in September 2010. The proceeds of $57 million, net of the underwriters' discount and fees of approximately $2 million were used for general corporate purposes. Note 5. Partners' Capital On August 31, 2010, the WMZ unitholders approved the merger between WMZ and us (see Note 1). As a result of the merger, false false false us-types:textBlockItemType textblock Footnote containing information related to the merger of WPZ and WMZ. In addition, it contains information related to an equity issuance of common units. No authoritative reference available. false 1 2 false UnKnown UnKnown UnKnown false true