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Financial Instruments and Risk Management - Derivative Instruments Not Designated as Hedge (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | $ 291 | $ 356
Debt securities issued by the U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments | 150 | 100
Euro-denominated Senior debt Floating Rate Notes issued by Lehman Brothers [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments | 59 | 5
U.S.-denominated Senior debt Floating Rate Notes issued by other financial institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments | 29 | 107
Available-for-sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments | 10 | 9
Equity securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments | 8 | 7
Cash Flow Hedging [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments designated as cash flow hedge | 29 | (67)
Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments designated as cash flow hedge | 6 | (6)
Debt securities issued by foreign governments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  | 81
Euro Denominated Senior Debt Floating Rate Notes Issued By Other Financial Institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  | 93
Euro Denominated Fixed Rate Debt Securities Issued By Other Financial Institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  | 27
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | 256 | 424
Fair Value, Inputs, Level 1 [Member] | Debt securities issued by the U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments | 150 | 100
Fair Value, Inputs, Level 1 [Member] | Euro-denominated Senior debt Floating Rate Notes issued by Lehman Brothers [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments | 59 |
Fair Value, Inputs, Level 1 [Member] | U.S.-denominated Senior debt Floating Rate Notes issued by other financial institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments | 29 | 107
Fair Value, Inputs, Level 1 [Member] | Available-for-sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments | 10 | 9
Fair Value, Inputs, Level 1 [Member] | Equity securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments | 8 | 7
Fair Value, Inputs, Level 1 [Member] | Cash Flow Hedging [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments designated as cash flow hedge |  |
Fair Value, Inputs, Level 1 [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments designated as cash flow hedge |  |
Fair Value, Inputs, Level 1 [Member] | Debt securities issued by foreign governments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  | 81
Fair Value, Inputs, Level 1 [Member] | Euro Denominated Senior Debt Floating Rate Notes Issued By Other Financial Institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  | 93
Fair Value, Inputs, Level 1 [Member] | Euro Denominated Fixed Rate Debt Securities Issued By Other Financial Institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  | 27
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total | 35 | (68)
Fair Value, Inputs, Level 2 [Member] | Debt securities issued by the U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 2 [Member] | Euro-denominated Senior debt Floating Rate Notes issued by Lehman Brothers [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  | 5
Fair Value, Inputs, Level 2 [Member] | U.S.-denominated Senior debt Floating Rate Notes issued by other financial institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 2 [Member] | Available-for-sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 2 [Member] | Equity securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 2 [Member] | Cash Flow Hedging [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments designated as cash flow hedge | 29 | (67)
Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments designated as cash flow hedge | 6 | (6)
Fair Value, Inputs, Level 2 [Member] | Debt securities issued by foreign governments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 2 [Member] | Euro Denominated Senior Debt Floating Rate Notes Issued By Other Financial Institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 2 [Member] | Euro Denominated Fixed Rate Debt Securities Issued By Other Financial Institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total |  |
Fair Value, Inputs, Level 3 [Member] | Debt securities issued by the U.S. Treasury [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 3 [Member] | Euro-denominated Senior debt Floating Rate Notes issued by Lehman Brothers [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 3 [Member] | U.S.-denominated Senior debt Floating Rate Notes issued by other financial institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 3 [Member] | Available-for-sale Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 3 [Member] | Equity securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 3 [Member] | Cash Flow Hedging [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments designated as cash flow hedge |  |
Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative instruments designated as cash flow hedge |  |
Fair Value, Inputs, Level 3 [Member] | Debt securities issued by foreign governments [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 3 [Member] | Euro Denominated Senior Debt Floating Rate Notes Issued By Other Financial Institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |
Fair Value, Inputs, Level 3 [Member] | Euro Denominated Fixed Rate Debt Securities Issued By Other Financial Institutions [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt securities issued by foreign governments |  |

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16383099&loc=d3e24584-111560 + Details
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