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Pension and Other Postretirement Benefit Plans - Fair Values of Pension Plan Assets (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Significant Unobservable Inputs (Level 3) [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | $ 622 | $ 692 | $ 637 | ||||||
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Significant Unobservable Inputs (Level 3) [Member] | Insurance contracts, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 540 | 496 | 428 | ||||||
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Pension Plans, Defined Benefit [Member]
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|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 17,435 | 15,349 | 12,481 | ||||||
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Pension Plans, Defined Benefit [Member] | Cash and Cash Equivalents [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 335 | 729 | |||||||
|
Pension Plans, Defined Benefit [Member] | Developed markets equities, Investment funds [Member]
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|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 8,451 | 6,669 | |||||||
|
Pension Plans, Defined Benefit [Member] | Emerging markets equities, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 1,199 | 892 | |||||||
|
Pension Plans, Defined Benefit [Member] | Government and agency obligations, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 1,473 | 999 | |||||||
|
Pension Plans, Defined Benefit [Member] | Corporate obligations, Investment Funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 265 | 260 | |||||||
|
Pension Plans, Defined Benefit [Member] | Fixed income obligations, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 162 | 220 | |||||||
|
Pension Plans, Defined Benefit [Member] | Real estate, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 110 | [1] | 159 | [1] | |||||
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Pension Plans, Defined Benefit [Member] | Developed markets, Equity securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 2,546 | 2,277 | |||||||
|
Pension Plans, Defined Benefit [Member] | Government and agency obligations, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 1,098 | 1,054 | |||||||
|
Pension Plans, Defined Benefit [Member] | Corporate obligations, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 741 | 1,008 | |||||||
|
Pension Plans, Defined Benefit [Member] | Mortgage and asset backed-securities, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 299 | 269 | |||||||
|
Pension Plans, Defined Benefit [Member] | Insurance contracts, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 668 | [2] | 613 | [2] | |||||
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Pension Plans, Defined Benefit [Member] | Other, Other investments [Member]
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|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 87 | 108 | |||||||
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Pension Plans, Defined Benefit [Member] | Assets [Member] | Derivatives, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 1 | 162 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member]
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|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 4,110 | 3,688 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Cash and Cash Equivalents [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 88 | 142 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Developed markets equities, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 808 | 683 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Emerging markets equities, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 163 | 121 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Government and agency obligations, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 293 | 279 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Corporate obligations, Investment Funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 188 | 166 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Fixed income obligations, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 17 | 14 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Real estate, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 4 | [1] | 4 | [1] | |||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Developed markets, Equity securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 2,546 | 2,277 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Government and agency obligations, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 2 | 2 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Corporate obligations, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Mortgage and asset backed-securities, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Insurance contracts, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | [2] | 0 | [2] | |||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Other, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Assets [Member] | Derivatives, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 1 | 0 | |||||||
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Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member]
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|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 12,703 | 10,969 | |||||||
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Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Cash and Cash Equivalents [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 247 | 587 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Developed markets equities, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 7,643 | 5,986 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Emerging markets equities, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 1,036 | 771 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Government and agency obligations, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 1,180 | 720 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate obligations, Investment Funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 77 | 94 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fixed income obligations, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 145 | 206 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Real estate, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 57 | [1] | 14 | [1] | |||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Developed markets, Equity securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Government and agency obligations, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 1,096 | 1,052 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate obligations, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 741 | 1,008 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage and asset backed-securities, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 299 | 269 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Insurance contracts, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 128 | [2] | 117 | [2] | |||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 54 | 53 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Assets [Member] | Derivatives, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 162 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 622 | 692 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cash and Cash Equivalents [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Developed markets equities, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Emerging markets equities, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Government and agency obligations, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate obligations, Investment Funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed income obligations, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Real estate, Investment funds [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 49 | [1] | 141 | [1] | |||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Developed markets, Equity securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Government and agency obligations, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate obligations, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage and asset backed-securities, Fixed income securities [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Insurance contracts, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 540 | [2] | 496 | [2] | |||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 33 | 55 | |||||||
|
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Assets [Member] | Derivatives, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Liability [Member] | Derivatives, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 70 | |||||||
|
Pension Plans, Defined Benefit [Member] | Liability [Member] | Quoted Prices In Active Markets for Identical Assets (Level 1) [Member] | Derivatives, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 0 | |||||||
|
Pension Plans, Defined Benefit [Member] | Liability [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivatives, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | 0 | 70 | |||||||
|
Pension Plans, Defined Benefit [Member] | Liability [Member] | Significant Unobservable Inputs (Level 3) [Member] | Derivatives, Other investments [Member]
|
|||||||||
| Defined Benefit Plan Disclosure [Line Items] | |||||||||
| Fair Value of Plan Assets | $ 0 | $ 0 | |||||||
|
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