Accounts payable - trade
Total receivables
Accounts Receivable, Net, Current
Less accumulated depreciation
Less allowance for uncollectible accounts
Accumulated removal costs (Note 1)
Statement of Financial Position [Unaudited)
Cash and Cash equivalents at end of period
Cash and cash equivalents at beginning of period
Cash and cash equivalents
Energy marketing receivables and energy marketing trade payables, net
Inventories
Gas, unbilled and other receivables
Change in derivative financial instrument assets and liabilities
Net payments and borrowings of short-term debt
Gas and trade payables
Accrued expenses
Increase (Decrease) in Accrued Liabilities
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Common Stock, shares authorized
Comprehensive income (loss) (Note 1)
Comprehensive income (Note 1)
Cost of Gas, Total
Cost of gas
Current liabilities
Total current liabilities
Total current liabilities
Customer deposits
Short-term debt (Note 6)
Long-term debt (Note 6)
Debt
Debt Disclosure [Text Block]
Deferred natural gas costs (Note 1)
Deferred income taxes
Depreciation and amortization
Derivative financial instruments - current portion (Note 2 and Note 3)
Derivative Instruments and Hedges, Noncurrent
Derivative Financial Instruments
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Derivative financial instruments - current portion (Note 2 and Note 3)
Derivative Liabilities, Current
Derivative financial instruments (Note 2 and Note 3)
Diluted earnings per common share attributable to AGL Resources Inc. common shareholders
Diluted earnings (loss) per common share attributable to AGL Resources Inc. common shareholders
Interest expense, net
Interest expense, net
Inventories, net (Note 1)
Total liabilities and equity
Total liabilities and equity
Total liabilities and other deferred credits
Total liabilities
Taxes other than income taxes
Distributions to noncontrolling interest
Minority Interest in Net Income (Loss)
Noncontrolling interest
Noncontrolling interest (Note 5)
Cash flows from financing activities
Net cash flow (used in) provided by financing activities
Net cash flow used in financing activities
Cash flows from investing activities
Net cash flow used in investing activities
Net Cash Provided by (Used in) Investing Activities
Cash flows from operating activities
Net cash flow provided by operating activities
Net Cash Provided by (Used in) Operating Activities
Net income attributable to AGL Resources Inc.
Net income (loss) attributable to AGL Resources Inc.
Net income (loss) attributable to AGL Resources Inc.
Net increase (decrease) in cash and cash equivalents
Long-term assets and other deferred debits
Total long-term assets and other deferred debits
Total long-term assets and other deferred debits
Long-term liabilities and other deferred credits
Total long-term liabilities and other deferred credits
Total long-term liabilities and other deferred credits
Operating income
Operating income
Operating revenues
Accounting Policies and Methods of Application
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Other - net
Other comprehensive (loss) income
Other comprehensive income (loss)
Reclassification of derivative financial instruments realized losses (gains) included in net income
Other Comprehensive Income, Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax
Derivative financial instruments unrealized (losses) gains arising during the period
Other Comprehensive Income, Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax
Other current assets
Other
Other income
Other income
Operation and maintenance
Dividends paid on common shares
Dividends paid on common shares
Employee Benefit Plans
Pension and Other Postretirement Benefits Disclosure [Text Block]
Issuance of variable rate gas facility revenue bonds
Issuance of treasury shares
Issuance of treasury shares and other
Distribution to noncontrolling interest
Property, plant and equipment
Property, plant and equipment-net
Payments to acquire, property, plant and equipment
Payments to acquire, property, plant and equipment
Payments of long-term debt
Payments of long-term debt
Segment Information
Segment Reporting Disclosure [Text Block]
Equity
Stockholders' Equity Note Disclosure [Text Block]
Current assets
Total current assets
Total current assets
Gas, unbilled and other receivables
Accounts Receivable, Gross, Current
Issuance of treasury shares, shares
Issuance of treasury shares, amount
Diluted
Basic
Total assets
Total assets
Receivables
Other current liabilities
Other long-term liabilities and other deferred credits
Dividends on common stock, per share
Accumulated deferred income taxes
Fair Value Measurements
Fair Value Disclosures [Text Block]
Basic earnings per common share attributable to AGL Resources Inc. common shareholders
Basic earnings (loss) per common share attributable to AGL Resources Inc. common shareholders
Other
Other Assets, Noncurrent
Per common share data (Note 1)
Earnings before income taxes
Income (Loss) from Continuing Operations before Income Taxes
Common Stock, par value
Income (Loss) from Continuing Operations before Income Taxes [Abstract]
AGL Resources Inc. common shareholders' equity, $5 par value 750,000,000 shares authorized
Income tax expense
Cash dividends declared per common share
Comprehensive income (loss) attributable to AGL Resources Inc. net of tax
Comprehensive income attributable to AGL Resources Inc. (net of tax)
Stock-based compensation expense (net of taxes) (Note 1)
Stock-based compensation expense, shares (net of taxes) (Note 1)
Operating expenses
Total operating expenses
Total operating expenses
Common stock shares, Beginning Balance
Common stock shares, Ending Balance
Shares, Issued
Net income
Less net (loss) income attributable to the noncontrolling interest (Note 5)
Net income (loss) attributable to noncontrolling interest
Total Comprehensive income (loss), including portion attributable to noncontrolling interest (net of tax)
Total comprehensive income (net of tax)
Comprehensive income (Note 1)
Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Comprehensive income (loss) (Note 1)
Comprehensive Income, Net of Tax, Attributable to Noncontrolling Interest
AGL Resources Inc. Common Shareholders Equity, Beginning Balance
AGL Resources Inc. Common Shareholders Equity, Ending Balance
Total Stockholders' Equity
Total equity
Accrued expenses
Other comprehensive income (loss)
Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
Other comprehensive income (loss)
Comprehensive income attributable to noncontrolling interest (net of tax)
Comprehensive income (loss) attributable to noncontrolling interest (net of tax)
Commitments and contingencies (Note 7)
Accrued pension obligations (Note 4)
Accrued postretirement benefit costs (Note 4)
Energy marketing receivables (Note 1)
Energy related receivables arising from financial instruments or contracts (options, swaps, contracts) with original maturity less than one year.
Energy Marketing Receivables
Unrecovered pipeline replacement program costs - current portion (Note 1)
Costs incurred to replace bare steel/cast iron pipes to be recovered through regulatory rate riders in less than one year.
Unrecovered Pipeline Replacement Program Costs Current Portion
Unrecovered environmental remediation costs - current portion (Note 1)
Costs incurred for the clean-up of environmental remediation sites to be recovered through regulatory rate riders in less than one year.
Unrecovered Environmental Remediation Costs Current Portion
Unrecovered pipeline replacement program costs (Note 1)
Costs incurred to replace bare steel/cast iron pipes to be recovered through regulatory rate riders beyond one year.
Unrecovered Pipeline Replacement Program Costs
Unrecovered environmental remediation costs (Note 1)
Costs incurred for the clean-up of environmental remediation sites to be recovered through regulatory rate riders beyond one year.
Unrecovered Environmental Remediation Costs
Energy marketing trade payables (Note 1)
Energy related payables arising from financial instruments or contracts (options, swaps, contracts) with original maturity less than one year.
Energy Marketing Trade Payables
Accrued pipeline replacement program costs - current portion (Note 1)
A regulatory reserve for expected costs replacing bare steel/cast iron pipes within one year.
Accrued Pipeline Replacement Program Costs Current Portion
Accrued environmental remediation liabilities - current portion (Note 1 and Note 7)
A regulatory reserve for the costs for clean-up of environmental remediation sites within one year.
Accrued Environmental Remediation Costs Current Portion
Accrued pipeline replacement program costs (Note 1)
A regulatory reserve for estimated costs of replacing bare steel/cast iron pipes beyond one year.
Accrued Pipeline Replacement Program Costs
Accrued environmental remediation liabilities (Note 1 and Note 7)
A regulatory reserve for the costs for clean-up of environmental remediation sites beyond one year.
Accrued Environmental Remediation Costs
Interest
Cash paid for interest (net of amount capitalized) during the period.
Income taxes
Cash paid for income taxes (net of amount deferred) during the period.
Derivative financial instruments unrealized (losses) gains arising during the period
Change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, net of tax effect. The after tax effect change includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses attributable to noncontrolling interest.
Other Comprehensive Income Unrealized Gains Losses On Derivatives Arising During Period Net Of Tax Attributable To Noncontrolling Interest
Reclassification of derivative financial instruments realized losses (gains) included in net income
Net of tax effect of the reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income attributable to noncontrolling interest during the period.
Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax Noncontrolling Interest
Reclassification of derivative financial instruments realized losses (gains) included in net income
Net of tax effect of the reclassification adjustment for accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges included in accumulated comprehensive income that was realized in net income during the period including portion attributable to noncontrolling interest.
Other Comprehensive Income Reclassification Adjustment On Derivatives Included In Net Income Including Portion Attributable To Noncontrolling Interest Net Of Tax
Derivative financial instruments unrealized (losses) gains arising during the period
Change in accumulated gains and losses from derivative instrument designated and qualifying as the effective portion of cash flow hedges, net of tax effect including portion attributable to noncontrolling interest. The after tax effect change includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Including Portion Attributable To Noncontrolling Interest Net Of Tax
Weighted-average number of common shares outstanding (Note 1)
Weighted Average Number Of Common Shares Outstanding
Cash paid during the period for
Cash Paid During The Period For [Abstract]
Statement of Income and Comprehensive Income [Abstract]
Statement [Line Items]
Other Comprehensive Income, Defined Benefit Plans Adjustment, Net of Tax
Income Statement [Abstract]
Statement of Stockholders' Equity [Abstract]
Statement [Table]
Statement, Equity Components [Axis]
Statement of Cash Flows [Abstract]
Equity Component [Domain]
Common Stock [Member]
Accumulated Other Comprehensive Income [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Noncontrolling Interest [Member]
Payments for (Proceeds from) Other Investing Activities
Repayments of Medium-term Notes
Issuance of senior notes
Repayments of Other Debt
Payments for Repurchase of Common Stock
Assets [Abstract]
Liabilities and Stockholders' Equity [Abstract]
Goodwill
Derivative financial instruments (Note 2 and Note 3)
Derivative Assets Noncurrent
Liabilities [Abstract]
Derivative Instruments and Hedges, Liabilities
Common Stock, Value, Issued
Additional Paid in Capital
Retained Earnings (Accumulated Deficit)
Treasury Stock, Value
Accumulated Other Comprehensive Income (Loss), Net of Tax
Subsequent Item
Prepaid Taxes
Prepaid taxes
Notes To Financial Statements [Abstract]
Stockholders' Equity
Equity
Dividends on common stock
Entity Text Block
Entity Registrant Name
Entity Central Index Key
Current Fiscal Year End Date
Entity Well Known Seasoned Issuer
Entity Voluntary Filers
Entity Current Reporting Status
Entity Filer Category
Entity Public Float
Entity Common Stock Shares Outstanding
Document Information Text Block
Document Name
Document Type
Document Period End Date
Amendment Description
Amendment Flag
Variable Interest Entity