2.2.0.25truefalse0141 - Statement - Consolidated Statements of Capitalization (Parenthetical)truefalseIn Millions, except Share data, unless otherwise specifiedfalse1falsefalseUSDfalsefalse12/31/2010 USD ($) $BalanceAsOf_31Dec2010http://www.sec.gov/CIK0000092122instant2010-12-31T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2falsefalseUSDfalsefalse12/31/2009 USD ($) $BalanceAsOf_31Dec2009http://www.sec.gov/CIK0000092122instant2009-12-31T00:00:000001-01-01T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$3falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Redeemable Preferred Stock, $25 stated value 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Redeemable_Preferred_Stock_Type_Three_Memberhttp://www.sec.gov/CIK0000092122instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseRedeemable Preferred Stock, $25 stated valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_RedeemablePreferredStockTypeThreeMemberus-gaap_StatementClassOfStockAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Redeemable Preferred Stock, $25 stated value 12/31/2009 USD ($) $BalanceAsOf_31Dec2009_Redeemable_Preferred_Stock_Type_Three_Memberhttp://www.sec.gov/CIK0000092122instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseRedeemable Preferred Stock, $25 stated valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_RedeemablePreferredStockTypeThreeMemberus-gaap_StatementClassOfStockAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Redeemable Preferred Stock, $1 par value 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Redeemable_Preferred_Stock_Type_Two_Memberhttp://www.sec.gov/CIK0000092122instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseRedeemable Preferred Stock, $1 par valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_RedeemablePreferredStockTypeTwoMemberus-gaap_StatementClassOfStockAxisexplicitMemberSharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$6falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Redeemable Preferred Stock, $1 par value 12/31/2009 USD ($) $BalanceAsOf_31Dec2009_Redeemable_Preferred_Stock_Type_Two_Memberhttp://www.sec.gov/CIK0000092122instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseRedeemable Preferred Stock, $1 par valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_RedeemablePreferredStockTypeTwoMemberus-gaap_StatementClassOfStockAxisexplicitMemberSharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$7falsefalsetruefalse{us-gaap_StatementClassOfStockAxis} : Redeemable Preferred Stock, $1 par value {us-gaap_SecurityClassOfRedeemablePreferredStockAxis} : Cumulative Preferred Stock 1/1/2010 - 12/31/2010 TwelveMonthsEnded_31Dec2010_Redeemable_Preferred_Stock_Type_Two_Member_Cumulative_Preferred_Stock_Memberhttp://www.sec.gov/CIK0000092122duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseRedeemable Preferred Stock, $1 par valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_RedeemablePreferredStockTypeTwoMemberus-gaap_StatementClassOfStockAxisexplicitMemberfalsefalseCumulative Preferred Stockus-gaap_SecurityClassOfRedeemablePreferredStockAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CumulativePreferredStockMemberus-gaap_SecurityClassOfRedeemablePreferredStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli08falsefalsetruefalse{us-gaap_StatementClassOfStockAxis} : Redeemable Preferred Stock, $1 par value {us-gaap_SecurityClassOfRedeemablePreferredStockAxis} : Cumulative Preferred Stock 1/1/2009 - 12/31/2009 TwelveMonthsEnded_31Dec2009_Cumulative_Preferred_Stock_Member_Redeemable_Preferred_Stock_Type_Two_Memberhttp://www.sec.gov/CIK0000092122duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseRedeemable Preferred Stock, $1 par valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_RedeemablePreferredStockTypeTwoMemberus-gaap_StatementClassOfStockAxisexplicitMemberfalsefalseCumulative Preferred Stockus-gaap_SecurityClassOfRedeemablePreferredStockAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CumulativePreferredStockMemberus-gaap_SecurityClassOfRedeemablePreferredStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli09falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Redeemable Preferred Stock, $100 par or stated value 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Redeemable_Preferred_Stock_Type_One_Memberhttp://www.sec.gov/CIK0000092122instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseRedeemable Preferred Stock, $100 par or stated valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_RedeemablePreferredStockTypeOneMemberus-gaap_StatementClassOfStockAxisexplicitMemberSharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$10falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Redeemable Preferred Stock, $100 par or stated value 12/31/2009 USD ($) $BalanceAsOf_31Dec2009_Redeemable_Preferred_Stock_Type_One_Memberhttp://www.sec.gov/CIK0000092122instant2009-12-31T00:00:000001-01-01T00:00:00falsefalseRedeemable Preferred Stock, $100 par or stated valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_RedeemablePreferredStockTypeOneMemberus-gaap_StatementClassOfStockAxisexplicitMemberSharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$11falsefalsetruefalse{us-gaap_StatementClassOfStockAxis} : Redeemable Preferred Stock, $100 par or stated value {us-gaap_SecurityClassOfRedeemablePreferredStockAxis} : Cumulative Preferred Stock 1/1/2010 - 12/31/2010 TwelveMonthsEnded_31Dec2010_Redeemable_Preferred_Stock_Type_One_Member_Cumulative_Preferred_Stock_Memberhttp://www.sec.gov/CIK0000092122duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseRedeemable Preferred Stock, $100 par or stated valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_RedeemablePreferredStockTypeOneMemberus-gaap_StatementClassOfStockAxisexplicitMemberfalsefalseCumulative Preferred Stockus-gaap_SecurityClassOfRedeemablePreferredStockAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CumulativePreferredStockMemberus-gaap_SecurityClassOfRedeemablePreferredStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli012falsefalsetruefalse{us-gaap_StatementClassOfStockAxis} : Redeemable Preferred Stock, $100 par or stated value {us-gaap_SecurityClassOfRedeemablePreferredStockAxis} : Cumulative Preferred Stock 1/1/2009 - 12/31/2009 TwelveMonthsEnded_31Dec2009_Cumulative_Preferred_Stock_Member_Redeemable_Preferred_Stock_Type_One_Memberhttp://www.sec.gov/CIK0000092122duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseRedeemable Preferred Stock, $100 par or stated valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_RedeemablePreferredStockTypeOneMemberus-gaap_StatementClassOfStockAxisexplicitMemberfalsefalseCumulative Preferred Stockus-gaap_SecurityClassOfRedeemablePreferredStockAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CumulativePreferredStockMemberus-gaap_SecurityClassOfRedeemablePreferredStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli013falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Preference Stock, $100 par or stated value 1/1/2010 - 12/31/2010 TwelveMonthsEnded_31Dec2010_Preference_Stock_Type_Two_Memberhttp://www.sec.gov/CIK0000092122duration2010-01-01T00:00:002010-12-31T00:00:00falsefalsePreference Stock, $100 par or stated valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_PreferenceStockTypeTwoMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0$14falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Preference Stock, $100 par or stated value 1/1/2009 - 12/31/2009 TwelveMonthsEnded_31Dec2009_Preference_Stock_Type_Two_Memberhttp://www.sec.gov/CIK0000092122duration2009-01-01T00:00:002009-12-31T00:00:00falsefalsePreference Stock, $100 par or stated valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_PreferenceStockTypeTwoMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$15falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Preference Stock, $1 par value 1/1/2010 - 12/31/2010 TwelveMonthsEnded_31Dec2010_Preference_Stock_Type_One_Memberhttp://www.sec.gov/CIK0000092122duration2010-01-01T00:00:002010-12-31T00:00:00falsefalsePreference Stock, $1 par valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_PreferenceStockTypeOneMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$16falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Preference Stock, $1 par value 1/1/2009 - 12/31/2009 TwelveMonthsEnded_31Dec2009_Preference_Stock_Type_One_Memberhttp://www.sec.gov/CIK0000092122duration2009-01-01T00:00:002009-12-31T00:00:00falsefalsePreference Stock, $1 par valueus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldiso_PreferenceStockTypeOneMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$17falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Noncumulative Preferred Stock 1/1/2010 - 12/31/2010 TwelveMonthsEnded_31Dec2010_Noncumulative_Preferred_Stock_Memberhttp://www.sec.gov/CIK0000092122duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseNoncumulative Preferred Stockus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_NoncumulativePreferredStockMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0$18falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Noncumulative Preferred Stock 1/1/2009 - 12/31/2009 TwelveMonthsEnded_31Dec2009_Noncumulative_Preferred_Stock_Memberhttp://www.sec.gov/CIK0000092122duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseNoncumulative Preferred Stockus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_NoncumulativePreferredStockMemberus-gaap_StatementClassOfStockAxisexplicitMemberPureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170SharesStandardhttp://www.xbrl.org/2003/instancesharesxbrli0$19falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Redeemable Preferred Stock of Subsidiaries 12/31/2010 USD ($) $BalanceAsOf_31Dec2010_Redeemable_Preferred_Stock_Memberhttp://www.sec.gov/CIK0000092122instant2010-12-31T00:00:000001-01-01T00:00:00falsefalseRedeemable Preferred Stock of Subsidiariesus-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_RedeemablePreferredStockMemberus-gaap_StatementClassOfStockAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false0us-gaap_PreferredStockParOrStatedValuePerShareus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3truefalsefalse2525falsetruefalsetruefalse4truefalsefalse2525falsetruefalsetruefalse5truefalsefalse11falsetruefalsetruefalse6truefalsefalse11falsetruefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9truefalsefalse100100falsetruefalsetruefalse10truefalsefalse100100falsetruefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13truefalsefalse100100falsetruefalsetruefalse14truefalsefalse100100falsetruefalsetruefalse15truefalsefalse11falsetruefalsetruefalse16truefalsefalse11falsetruefalsetruefalse17truefalsefalse2525falsetruefalsetruefalse18truefalsefalse2525falsetruefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalseEPSus-types:perShareItemTypedecimalFace amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 falsetruePreferred Stock, Par or Stated Value Per Share3false0us-gaap_RedeemablePreferredStockSharesAuthorizedus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5truefalsefalse2800000028000000falsefalsefalsetruefalse6truefalsefalse2800000028000000falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9truefalsefalse2000000020000000falsefalsefalsetruefalse10truefalsefalse2000000020000000falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalseSharesxbrli:sharesItemTypesharesThe maximum number of redeemable preferred shares permitted to be issued by an entity's charter and bylaws.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 falsefalseRedeemable Cumulative preferred stock, Authorized4false0us-gaap_RedeemablePreferredStockSharesOutstandingus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5truefalsefalse1200000012000000falsefalsefalsetruefalse6truefalsefalse1200000012000000falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9truefalsefalse10000001000000falsefalsefalsetruefalse10truefalsefalse10000001000000falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalseSharesxbrli:sharesItemTypesharesThe number of redeemable preferred shares that have been issued and are held by the entity's shareholders. Shares outstanding equals shares issued minus shares held in treasury.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 28 -Article 5 falsefalseRedeemable Cumulative preferred stock, Outstanding5false0us-gaap_PreferredStockSharesAuthorizedus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15truefalsefalse6500000065000000falsefalsefalsetruefalse16truefalsefalse6500000065000000falsefalsefalsetruefalse17truefalsefalse6000000060000000falsefalsefalsetruefalse18truefalsefalse6000000060000000falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalseSharesxbrli:sharesItemTypesharesThe maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 falsefalsePreferred Stock, Shares Authorized6false0us-gaap_PreferredStockSharesOutstandingus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13truefalsefalse30000003000000falsefalsefalsetruefalse14truefalsefalse30000003000000falsefalsefalsetruefalse15truefalsefalse1400000014000000falsefalsefalsetruefalse16truefalsefalse1400000014000000falsefalsefalsetruefalse17truefalsefalse20000002000000falsefalsefalsetruefalse18truefalsefalse20000002000000falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalseSharesxbrli:sharesItemTypesharesAggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 falsefalsePreferred Stock, Shares Outstanding7false0us-gaap_CommonStockParOrStatedValuePerShareus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse55falsetruefalsefalsefalse2truefalsefalse55falsetruefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalseEPSus-types:perShareItemTypedecimalFace amount or stated value of common stock per share; generally not indicative of the fair market value per share.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 falsetrueCommon stock, Par value8false0us-gaap_CommonStockSharesAuthorizedus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse10000000001000000000falsefalsefalsefalsefalse2truefalsefalse10000000001000000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalseSharesxbrli:sharesItemTypesharesThe maximum number of common shares permitted to be issued by an entity's charter and bylaws.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 falsefalseCommon stock, shares Authorized9false0us-gaap_CommonStockSharesIssuedus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse844000000844000000falsefalsefalsefalsefalse2truefalsefalse820000000820000000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalseSharesxbrli:sharesItemTypesharesTotal number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 falsefalseCommon stock, shares Issued10false0us-gaap_TreasuryStockSharesus-gaaptruenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse500000500000falsefalsefalsefalsefalse2truefalsefalse500000500000falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalseSharesxbrli:sharesItemTypesharesNumber of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 falsefalseTreasury shares11false0so_AnnualizedInterestLongTermDebtsofalsecreditinstantRepresents the interest expected to be incurred during the next twelve months on long-term debt.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse876000000876falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryRepresents the interest expected to be incurred during the next twelve months on long-term debt.No authoritative reference available.falsefalseAnnual interest requirement12false0so_AnnualDividendPreferredAndPreferenceStocksofalsecreditinstantRepresents the dividend expected to be paid during the next twelve months to preferred and/or preference stockholders.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse4500000045falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsefalsefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalse6falsefalsefalse00falsefalsefalsetruefalse7falsefalsefalse00falsefalsefalsetruefalse8falsefalsefalse00falsefalsefalsetruefalse9falsefalsefalse00falsefalsefalsetruefalse10falsefalsefalse00falsefalsefalsetruefalse11falsefalsefalse00falsefalsefalsetruefalse12falsefalsefalse00falsefalsefalsetruefalse13falsefalsefalse00falsefalsefalsetruefalse14falsefalsefalse00falsefalsefalsetruefalse15falsefalsefalse00falsefalsefalsetruefalse16falsefalsefalse00falsefalsefalsetruefalse17falsefalsefalse00falsefalsefalsetruefalse18falsefalsefalse00falsefalsefalsetruefalse19truefalsefalse2000000020falsetruefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryRepresents the dividend expected to be paid during the next twelve months to preferred and/or preference stockholders.No authoritative reference available.falsefalseAnnual dividend requirement13false0so_PreferredStockDividendRateStatedPercentageRateRangeMinimumsofalsenadurationPreferred Stock Dividend Rate Stated Percentage Rate Range Minimum.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsetruefalse4falsetruefalse00falsefalsefalsetruefalse5falsetruefalse00falsefalsefalsetruefalse6falsetruefalse00falsefalsefalsetruefalse7truetruefalse0.05200.0520falsefalsefalsetruefalse8truetruefalse0.05200.0520falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11truetruefalse0.04200.0420falsefalsefalsetruefalse12truetruefalse0.04200.0420falsefalsefalsetruefalse13truetruefalse0.06000.0600falsefalsefalsetruefalse14truetruefalse0.06000.0600falsefalsefalsetruefalse15truetruefalse0.05630.0563falsefalsefalsetruefalse16truetruefalse0.05630.0563falsefalsefalsetruefalse17truetruefalse0.06000.0600falsefalsefalsetruefalse18truetruefalse0.06000.0600falsefalsefalsetruefalse19falsetruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepurePreferred Stock Dividend Rate Stated Percentage Rate Range Minimum.No authoritative reference available.falsefalseDividend Rate, Minimum14false0so_PreferredStockDividendRateStatedPercentageRateRangeMaximumsofalsenadurationPreferred Stock Dividend Rate Stated Percentage Rate Range Maximum.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsetruefalse00falsefalsefalsefalsefalse2falsetruefalse00falsefalsefalsefalsefalse3falsetruefalse00falsefalsefalsetruefalse4falsetruefalse00falsefalsefalsetruefalse5falsetruefalse00falsefalsefalsetruefalse6falsetruefalse00falsefalsefalsetruefalse7truetruefalse0.05830.0583falsefalsefalsetruefalse8truetruefalse0.05830.0583falsefalsefalsetruefalse9falsetruefalse00falsefalsefalsetruefalse10falsetruefalse00falsefalsefalsetruefalse11truetruefalse0.05440.0544falsefalsefalsetruefalse12truetruefalse0.05440.0544falsefalsefalsetruefalse13truetruefalse0.06500.0650falsefalsefalsetruefalse14truetruefalse0.06500.0650falsefalsefalsetruefalse15truetruefalse0.06500.0650falsefalsefalsetruefalse16truetruefalse0.06500.0650falsefalsefalsetruefalse17truetruefalse0.06130.0613falsefalsefalsetruefalse18truetruefalse0.06130.0613falsefalsefalsetruefalse19falsetruefalse00falsefalsefalsetruefalseOtherus-types:percentItemTypepurePreferred Stock Dividend Rate Stated Percentage Rate Range Maximum.No authoritative reference available.falsefalseDividend Rate, Maximum1913Consolidated Statements of Capitalization (Parenthetical) (USD $)MillionsNoRoundingNoRoundingUnKnowntruetrue