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Pension and Other Postretirement Benefits - Schedule of Fair Value of Pension and Postretirement Plans' Assets (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | $ 11,043 | $ 10,339
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 3,635 | 3,490
Equity Securities [Member] | Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 2,329 | 2,217
Equity Securities [Member] | Hedge Funds, Equity Long (Short) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 756 | 731
Equity Securities [Member] | Private Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 550 | 542
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 5,580 | 5,314
Fixed Income Securities [Member] | Intermediate and Long Duration Government Credit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 5,073 | 4,974
Fixed Income Securities [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 507 | 340
Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,828 | 1,535
Other Investments [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 459 | 321
Other Investments [Member] | Real Estate Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 573 | 546
Other Investments [Member] | Hedge Funds, Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 796 | 668
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 2,510 | 2,422
Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,016 | 904
Level 1 [Member] | Equity Securities [Member] | Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,016 | 904
Level 1 [Member] | Equity Securities [Member] | Hedge Funds, Equity Long (Short) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  |
Level 1 [Member] | Equity Securities [Member] | Private Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  |
Level 1 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,169 | 1,223
Level 1 [Member] | Fixed Income Securities [Member] | Intermediate and Long Duration Government Credit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,169 | 1,223
Level 1 [Member] | Fixed Income Securities [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  |
Level 1 [Member] | Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 325 | 295
Level 1 [Member] | Other Investments [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 212 | 198
Level 1 [Member] | Other Investments [Member] | Real Estate Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 113 | 97
Level 1 [Member] | Other Investments [Member] | Hedge Funds, Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  |
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 5,475 | 5,157
Level 2 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,196 | 1,203
Level 2 [Member] | Equity Securities [Member] | Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,196 | 1,203
Level 2 [Member] | Equity Securities [Member] | Hedge Funds, Equity Long (Short) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  |
Level 2 [Member] | Equity Securities [Member] | Private Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  |
Level 2 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 4,196 | 3,880
Level 2 [Member] | Fixed Income Securities [Member] | Intermediate and Long Duration Government Credit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 3,689 | 3,540
Level 2 [Member] | Fixed Income Securities [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 507 | 340
Level 2 [Member] | Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 83 | 74
Level 2 [Member] | Other Investments [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  |
Level 2 [Member] | Other Investments [Member] | Real Estate Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 83 | 74
Level 2 [Member] | Other Investments [Member] | Hedge Funds, Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  |
Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 3,058 | 2,760
Level 3 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,423 | 1,383
Level 3 [Member] | Equity Securities [Member] | Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 117 | 110
Level 3 [Member] | Equity Securities [Member] | Hedge Funds, Equity Long (Short) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 756 | 731
Level 3 [Member] | Equity Securities [Member] | Private Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 550 | 542
Level 3 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 215 | 211
Level 3 [Member] | Fixed Income Securities [Member] | Intermediate and Long Duration Government Credit [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 215 | 211
Level 3 [Member] | Fixed Income Securities [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  |
Level 3 [Member] | Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,420 | 1,166
Level 3 [Member] | Other Investments [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 247 | 123
Level 3 [Member] | Other Investments [Member] | Real Estate Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 377 | 375
Level 3 [Member] | Other Investments [Member] | Hedge Funds, Equity [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | $ 796 | $ 668

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -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 Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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