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Pension and Other Postretirement Benefits - Schedule of Fair Value of Pension Plan Assets (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | $ 10,421 | $ 11,043
Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 3,852 | 3,635
Equity Securities [Member] | Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 2,588 | 2,329
Equity Securities [Member] | Hedge Funds, Equity Long (Short) [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 744 | 756
Equity Securities [Member] | Private Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 520 | 550
Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 4,271 | 5,580
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 | 3,802 | 5,073
Fixed Income Securities [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 469 | 507
Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 2,298 | 1,828
Other Investments [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 375 | 459
Other Investments [Member] | Real Estate Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 636 | 573
Other Investments [Member] | Discretionary and Systematic Macro Hedge Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,287 |
Other Investments [Member] | Discretionary Macro Hedge Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  | 796
Level 1 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 3,602 | 2,510
Level 1 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,084 | 1,016
Level 1 [Member] | Equity Securities [Member] | Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,084 | 1,016
Level 1 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 2,251 | 1,169
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 | 2,251 | 1,169
Level 1 [Member] | Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 267 | 325
Level 1 [Member] | Other Investments [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 143 | 212
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 | 124 | 113
Level 2 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 3,398 | 5,414
Level 2 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,360 | 1,196
Level 2 [Member] | Equity Securities [Member] | Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,360 | 1,196
Level 2 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 2,020 | 4,196
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 | 1,551 | 3,689
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 | 469 | 507
Level 2 [Member] | Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 18 | 22
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 | 18 | 22
Level 3 [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 3,421 | 3,119
Level 3 [Member] | Equity Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,408 | 1,423
Level 3 [Member] | Equity Securities [Member] | Equity Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 144 | 117
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 | 744 | 756
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 | 520 | 550
Level 3 [Member] | Fixed Income Securities [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  | 215
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
Level 3 [Member] | Other Investments [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 2,013 | 1,481
Level 3 [Member] | Other Investments [Member] | Other Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 232 | 247
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 | 494 | 438
Level 3 [Member] | Other Investments [Member] | Discretionary and Systematic Macro Hedge Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets | 1,287 |
Level 3 [Member] | Other Investments [Member] | Discretionary Macro Hedge Funds [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of pension and other postretirement plans' assets |  | $ 796

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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 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: 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=29635418&loc=d3e12355-114930 + Details
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