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Fair Value of Pension Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets $ 8,902 $ 9,504  
Pension Plans | U.S. Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 2 124  
Pension Plans | Non-U.S. Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 413 698  
Pension Plans | Pooled Funds - Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 2,411 2,192  
Pension Plans | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 2,826 3,014  
Pension Plans | Government Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,788 2,283  
Pension Plans | Pooled Funds - Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,182 1,151  
Pension Plans | Corporate Bonds And Other Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,691 1,174  
Pension Plans | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 4,661 4,608  
Pension Plans | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 477 406  
Pension Plans | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 499 829  
Pension Plans | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 204 237  
Pension Plans | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 140 253  
Pension Plans | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 95 157  
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,980 2,699  
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 2 124  
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans | Non-U.S. Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 413 698  
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 569 538  
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 984 1,360  
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 53 234  
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 311 311  
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 325 314  
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 689 859  
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 115 110  
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 137 246  
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 55 124  
Significant Other Observable Inputs (Level 2) | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 5,083 4,598  
Significant Other Observable Inputs (Level 2) | Pension Plans | Pooled Funds - Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,842 1,654  
Significant Other Observable Inputs (Level 2) | Pension Plans | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,842 1,654  
Significant Other Observable Inputs (Level 2) | Pension Plans | Government Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,735 2,049  
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 759 743  
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 701 111  
Significant Other Observable Inputs (Level 2) | Pension Plans | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 3,195 2,903  
Significant Other Observable Inputs (Level 2) | Pension Plans | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 7 4  
Significant Other Observable Inputs (Level 2) | Pension Plans | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 3 7  
Significant Other Observable Inputs (Level 2) | Pension Plans | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 36 30  
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,839 2,207 $ 2,109
Significant Unobservable Inputs (Level 3) | Pooled Funds - Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 112 97 15
Significant Unobservable Inputs (Level 3) | Corporate Bonds And Other Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 665 749 780
Significant Unobservable Inputs (Level 3) | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 355 292 267
Significant Unobservable Inputs (Level 3) | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 499 829 820
Significant Unobservable Inputs (Level 3) | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 208 240 $ 227
Significant Unobservable Inputs (Level 3) | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,839 2,207  
Significant Unobservable Inputs (Level 3) | Pension Plans | Pooled Funds - Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 112 97  
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 665 749  
Significant Unobservable Inputs (Level 3) | Pension Plans | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 777 846  
Significant Unobservable Inputs (Level 3) | Pension Plans | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 355 292  
Significant Unobservable Inputs (Level 3) | Pension Plans | Hedge Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 499 829  
Significant Unobservable Inputs (Level 3) | Pension Plans | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 204 237  
Significant Unobservable Inputs (Level 3) | Pension Plans | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets $ 4 $ 3