This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details

The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 18

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585

+ Details

Financial Instruments, Available For Sale Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Available For Sale Securities: Special Use Funds - Equity Securities [Member]	Dec. 31, 2011 Available For Sale Securities: Special Use Funds - Equity Securities [Member]	Mar. 31, 2012 Available For Sale Securities: Special Use Funds - U.S. Government And Municipal Bonds [Member]	Dec. 31, 2011 Available For Sale Securities: Special Use Funds - U.S. Government And Municipal Bonds [Member]	Mar. 31, 2012 Available For Sale Securities: Special Use Funds - Corporate Debt Securities [Member]	Dec. 31, 2011 Available For Sale Securities: Special Use Funds - Corporate Debt Securities [Member]	Mar. 31, 2012 Available For Sale Securities: Special Use Funds - Mortgage-Backed Securities [Member]	Dec. 31, 2011 Available For Sale Securities: Special Use Funds - Mortgage-Backed Securities [Member]	Mar. 31, 2012 Available For Sale Securities: Special Use Funds - Other Debt Securities [Member]	Dec. 31, 2011 Available For Sale Securities: Special Use Funds - Other Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Realized Gains	$ 43	$ 30
Available-for-sale Securities, Gross Realized Losses	12	21
Available For Sale Securities Gross Unrealized Gains Abstract
Unrealized gains			755	546	26	46	28	31	25	27	2	3
Proceeds from Sale and Maturity of Available-for-sale Securities	$ 936	$ 1,347