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Investment Securities (Details) (USD $) In Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2011 | Dec. 31, 2010
Schedule of Available for Sale Securities by Type |  |
Cost | $ 9,207 | $ 13,937
Gross Unrealized Gains | 469 | 444
Gross Unrealized Losses | (247) | (371)
Investment securities | 9,429 | 14,010
U.S. States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 5,363 | 6,140
Gross Unrealized Gains | 40 | 24
Gross Unrealized Losses | (246) | (367)
Investment securities | 5,157 | 5,797
U.S. Government agency obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 352 | 3,402
Gross Unrealized Gains | 5 | 12
Gross Unrealized Losses | 0 | (1)
Investment securities | 357 | 3,413
U.S. Government treasury obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 1,935 | 2,450
Gross Unrealized Gains | 8 | 6
Gross Unrealized Losses | 0 | 0
Investment securities | 1,943 | 2,456
Corporate debt securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 1,011 | 1,431
Gross Unrealized Gains | 15 | 15
Gross Unrealized Losses | 0 | (1)
Investment securities | 1,026 | 1,445
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 277 | 272
Gross Unrealized Gains | 9 | 6
Gross Unrealized Losses | (1) | (2)
Investment securities | 285 | 276
Equity securities [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 98 | 98
Gross Unrealized Gains | 386 | 377
Gross Unrealized Losses | 0 | 0
Investment securities | 484 | 475
Foreign government bonds and obligations [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 111 | 95
Gross Unrealized Gains | 6 | 4
Gross Unrealized Losses | 0 | 0
Investment securities | 117 | 99
Availabe For Sale Securities Other [Member] |  |
Schedule of Available for Sale Securities by Type |  |
Cost | 60 | 49
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Investment securities | $ 60 | $ 49

X
- Definition For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading. Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss 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, as should other than temporary declines in fair value below costs basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 + Details
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- Definition This 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. + References 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 + Details
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- Definition This item represents the gross unrealized losses for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized losses are the excess of the carrying value of the Available-for-sale Securities over their fair value as of the reporting date. Such gross unrealized losses are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding loss 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, as should other than temporary declines in fair value below costs basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 + Details
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