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Contractual Obligations And Commitments (Details) (USD $)
In Millions
9 Months Ended
Sep. 30, 2011
Recorded Unconditional Purchase Obligation [Line Items] 
Recorded Unconditional Purchase Obligation$ 3,150
Recorded Unconditional Purchase Obligation Due Within One Year15
Recorded Unconditional Purchase Obligation Due In Second Year152
Recorded Unconditional Purchase Obligation Due In Third Year394
Recorded Unconditional Purchase Obligation Due In Fourth Year32
Recorded Unconditional Purchase Obligation Due In Fifth Year218
Recorded Unconditional Purchase Obligation Due After Fifth Year2,339
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unrecorded Unconditional Purchase Obligations4,091[1]
Unrecorded Unconditional Purchase Obligation Balance On First Anniversary199[1]
Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary631[1]
Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary472[1]
Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary343[1]
Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary252[1]
Unrecorded Unconditional Purchase Obligation Due After Five Years2,194[1]
Footnotes To Unrecorded Contractual Obligations And Commitments 
Merger Termination Fee67
Merger Termination Fee Due To Failure To Obtain Financing115
Accrued interest35
Minimum sublease rentals due in future13
Natural Gas Purchase Commitment At Floating Prices Amount40
Long Term Debt [Member]
 
Recorded Unconditional Purchase Obligation [Line Items] 
Recorded Unconditional Purchase Obligation2,687
Recorded Unconditional Purchase Obligation Due Within One Year0
Recorded Unconditional Purchase Obligation Due In Second Year0
Recorded Unconditional Purchase Obligation Due In Third Year225
Recorded Unconditional Purchase Obligation Due In Fourth Year0
Recorded Unconditional Purchase Obligation Due In Fifth Year200
Recorded Unconditional Purchase Obligation Due After Fifth Year2,262
Recoverable regulatory infrastructure program costs [Member]
 
Recorded Unconditional Purchase Obligation [Line Items] 
Recorded Unconditional Purchase Obligation257[2]
Recorded Unconditional Purchase Obligation Due Within One Year11[2]
Recorded Unconditional Purchase Obligation Due In Second Year108[2]
Recorded Unconditional Purchase Obligation Due In Third Year138[2]
Recorded Unconditional Purchase Obligation Due In Fourth Year0[2]
Recorded Unconditional Purchase Obligation Due In Fifth Year0[2]
Recorded Unconditional Purchase Obligation Due After Fifth Year0[2]
Enviromental Remediation Liabilities [Member]
 
Recorded Unconditional Purchase Obligation [Line Items] 
Recorded Unconditional Purchase Obligation189[2]
Recorded Unconditional Purchase Obligation Due Within One Year4[2]
Recorded Unconditional Purchase Obligation Due In Second Year27[2]
Recorded Unconditional Purchase Obligation Due In Third Year31[2]
Recorded Unconditional Purchase Obligation Due In Fourth Year32[2]
Recorded Unconditional Purchase Obligation Due In Fifth Year18[2]
Recorded Unconditional Purchase Obligation Due After Fifth Year77[2]
Short Term Debt [Member]
 
Recorded Unconditional Purchase Obligation [Line Items] 
Recorded Unconditional Purchase Obligation17
Recorded Unconditional Purchase Obligation Due Within One Year0
Recorded Unconditional Purchase Obligation Due In Second Year17
Recorded Unconditional Purchase Obligation Due In Third Year0
Recorded Unconditional Purchase Obligation Due In Fourth Year0
Recorded Unconditional Purchase Obligation Due In Fifth Year0
Recorded Unconditional Purchase Obligation Due After Fifth Year0
Pipeline Charges Storage Capacity And Gas Supply [Member]
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unrecorded Unconditional Purchase Obligations1,750[1],[3]
Unrecorded Unconditional Purchase Obligation Balance On First Anniversary156[1],[3]
Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary455[1],[3]
Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary320[1],[3]
Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary202[1],[3]
Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary123[1],[3]
Unrecorded Unconditional Purchase Obligation Due After Five Years494[1],[3]
Interest Expense [Member]
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unrecorded Unconditional Purchase Obligations2,118[1],[4]
Unrecorded Unconditional Purchase Obligation Balance On First Anniversary34[1],[4]
Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary133[1],[4]
Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary126[1],[4]
Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary123[1],[4]
Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary113[1],[4]
Unrecorded Unconditional Purchase Obligation Due After Five Years1,589[1],[4]
Furniture And Equipment Rental Expense Operating Lease [Member]
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unrecorded Unconditional Purchase Obligations188[1],[5]
Unrecorded Unconditional Purchase Obligation Balance On First Anniversary5[1],[5]
Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary19[1],[5]
Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary20[1],[5]
Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary17[1],[5]
Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary16[1],[5]
Unrecorded Unconditional Purchase Obligation Due After Five Years111[1],[5]
Asset Management [Member]
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unrecorded Unconditional Purchase Obligations20[1],[6]
Unrecorded Unconditional Purchase Obligation Balance On First Anniversary3[1],[6]
Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary10[1],[6]
Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary6[1],[6]
Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary1[1],[6]
Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary0[1],[6]
Unrecorded Unconditional Purchase Obligation Due After Five Years0[1],[6]
Financial Standby Letter Of Credit [Member]
 
Unrecorded Unconditional Purchase Obligation [Line Items] 
Unrecorded Unconditional Purchase Obligations15[1]
Unrecorded Unconditional Purchase Obligation Balance On First Anniversary1[1]
Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary14[1]
Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary0[1]
Unrecorded Unconditional Purchase Obligation Balance On Fourth Anniversary0[1]
Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary0[1]
Unrecorded Unconditional Purchase Obligation Due After Five Years$ 0[1]
[1]In accordance with GAAP, these items are not reflected in our Condensed Consolidated Statements of Financial Position.
[2]Includes amounts recoverable through rate rider mechanisms.
[3]Includes amounts recoverable through a natural gas cost recovery mechanism or alternatively billed to Marketers, and includes demand charges associated with Sequent. Also includes SouthStars natural gas purchase commitments of 10 Bcf at floating gas prices calculated using forward natural gas prices as of September 30, 2011, and are valued at $40 million.
[4]Floating rate debt is based on the interest rate as of September 30, 2011, and the maturity of the underlying debt instrument. As of September 30, 2011, we have $35 million of accrued interest on our Condensed Consolidated Statements of Financial Position that will be paid over the next 12 months.
[5]We have certain operating leases with provisions for step rent or escalation payments and certain lease concessions. We account for these leases by recognizing the future minimum lease payments on a straight-line basis over the respective minimum lease terms, in accordance with authoritative guidance related to leases. However, this lease accounting treatment does not affect the future annual operating lease cash obligations as shown herein. Additionally, minimum payments have not been reduced by minimum sublease rentals of $13 million due in the future under noncancelable subleases.
[6]Represent fixed-fee minimum payments for Sequents asset management agreements.