2.2.0.25truefalse40703 - Disclosure - Investments in Available-for-Sale Securities and Other Cost Investments (Unrealized Holding Gains and Losses) (Details)truefalseIn Millionsfalse1falsefalseUSDfalsefalse1/1/2008 - 1/31/2008 USD ($) $Duration_1_1_2008_To_1_31_2008http://www.sec.gov/CIK0001355096duration2008-01-01T00:00:002008-01-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] 1/1/2010 - 12/31/2010 USD ($) $Duration_1_1_2010_To_12_31_2010223http://www.sec.gov/CIK0001355096duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseEquity Securities [Member]us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Equity Securities [Member] 1/1/2009 - 12/31/2009 USD ($) $Duration_1_1_2009_To_12_31_200924http://www.sec.gov/CIK0001355096duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseEquity Securities [Member]us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_EquitySecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt Securities [Member] 1/1/2010 - 12/31/2010 USD ($) $Duration_1_1_2010_To_12_31_2010222http://www.sec.gov/CIK0001355096duration2010-01-01T00:00:002010-12-31T00:00:00falsefalseDebt Securities [Member]us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5falsefalseUSDtruefalse{us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis} : Debt Securities [Member] 1/1/2009 - 12/31/2009 USD ($) $Duration_1_1_2009_To_12_31_200923http://www.sec.gov/CIK0001355096duration2009-01-01T00:00:002009-12-31T00:00:00falsefalseDebt Securities [Member]us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_DebtSecuritiesMemberus-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGainsus-gaaptruecreditdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse10400000001040falsetruefalsefalsefalse2truefalsefalse3200000032falsetruefalsetruefalse3truefalsefalse258000000258falsetruefalsetruefalse4truefalsefalse6600000066falsetruefalsetruefalse5truefalsefalse6900000069falsetruefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThis item represents the gross unrealized gains for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized gains are the excess of the fair value of the Available-for-sale Securities over their carrying value as of the reporting date. Such gross unrealized gains are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge. All or a portion of the unrealized holding gain of an available-for-sale security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 falsefalseGross unrealized holding gains51Investments in Available-for-Sale Securities and Other Cost Investments (Unrealized Holding Gains and Losses) (Details) (USD $)MillionsUnKnownUnKnownUnKnownfalsetrue