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Fair Value of Pension Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 8,534 | $ 6,817 |
Investments measured at net asset value | 2,439 | 2,667 |
Total investments at fair value | 10,973 | 9,484 |
Pension Plans | U.S. Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2 | 1 |
Pension Plans | Non-U.S. Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 5 | 427 |
Pension Plans | Pooled Funds - Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2,340 | 1,524 |
Pension Plans | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2,347 | 1,952 |
Pension Plans | Government Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 3,237 | 3,009 |
Pension Plans | Pooled Funds - Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 602 | 756 |
Pension Plans | Corporate Bonds And Other Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2,102 | 852 |
Pension Plans | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 5,941 | 4,617 |
Pension Plans | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 156 | 170 |
Pension Plans | Private Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2 | 2 |
Pension Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 86 | 73 |
Pension Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2 | 3 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,658 | 1,382 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | U.S. Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2 | 1 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Non-U.S. Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 5 | 427 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Pooled Funds - Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 848 | 286 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 855 | 714 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Government Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 34 | 37 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Pooled Funds - Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 449 | 103 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Corporate Bonds And Other Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 133 | 357 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 616 | 497 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 120 | 98 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Private Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 66 | 72 |
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1 | 1 |
Significant Other Observable Inputs (Level 2) | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 6,060 | 4,833 |
Significant Other Observable Inputs (Level 2) | Pension Plans | U.S. Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plans | Non-U.S. Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plans | Pooled Funds - Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,492 | 1,235 |
Significant Other Observable Inputs (Level 2) | Pension Plans | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,492 | 1,235 |
Significant Other Observable Inputs (Level 2) | Pension Plans | Government Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 3,203 | 2,972 |
Significant Other Observable Inputs (Level 2) | Pension Plans | Pooled Funds - Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 153 | 618 |
Significant Other Observable Inputs (Level 2) | Pension Plans | Corporate Bonds And Other Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,179 | (43) |
Significant Other Observable Inputs (Level 2) | Pension Plans | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 4,535 | 3,547 |
Significant Other Observable Inputs (Level 2) | Pension Plans | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 13 | 50 |
Significant Other Observable Inputs (Level 2) | Pension Plans | Private Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Significant Other Observable Inputs (Level 2) | Pension Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 20 | 1 |
Significant Other Observable Inputs (Level 2) | Pension Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 816 | 602 | $ 924
Significant Unobservable Inputs (Level 3) | Non-U.S. Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 3 | 0
Significant Unobservable Inputs (Level 3) | Pooled Funds - Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 35 | 26
Significant Unobservable Inputs (Level 3) | Corporate Bonds And Other Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 790 | 538 | 665
Significant Unobservable Inputs (Level 3) | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 23 | 22 | $ 230
Significant Unobservable Inputs (Level 3) | Pension Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 816 | 602 |
Significant Unobservable Inputs (Level 3) | Pension Plans | U.S. Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plans | Non-U.S. Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plans | Pooled Funds - Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 3 |
Significant Unobservable Inputs (Level 3) | Pension Plans | Equity Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 3 |
Significant Unobservable Inputs (Level 3) | Pension Plans | Government Bonds |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plans | Pooled Funds - Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 35 |
Significant Unobservable Inputs (Level 3) | Pension Plans | Corporate Bonds And Other Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 790 | 538 |
Significant Unobservable Inputs (Level 3) | Pension Plans | Fixed Income Securities |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 790 | 573 |
Significant Unobservable Inputs (Level 3) | Pension Plans | Real Estate |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 23 | 22 |
Significant Unobservable Inputs (Level 3) | Pension Plans | Private Equity |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 2 | 2 |
Significant Unobservable Inputs (Level 3) | Pension Plans | Cash |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Pension Plans | Other |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 1 | $ 2 |

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