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Fair Value of Pension Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets $ 6,817 $ 6,480  
Investments measured at net asset value 2,667 2,422  
Total investments at fair value 9,484 8,902  
Pension Plans | U.S. Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1 2  
Pension Plans | Non-U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 427 498  
Pension Plans | Pooled Funds - Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,524 1,468  
Pension Plans | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,952 1,968  
Pension Plans | Government Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 3,009 1,770  
Pension Plans | Pooled Funds - Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 756 575  
Pension Plans | Corporate Bonds And Other Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 852 1,686  
Pension Plans | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 4,617 4,031  
Pension Plans | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 170 339  
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 73 138  
Pension Plans | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 3 2  
Quoted Prices In Active Markets For Identical Assets (Level 1) | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,382 1,410  
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 1 2  
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 427 412  
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 286 275  
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 714 689  
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 37 35  
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 103 118  
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 357 320  
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 497 473  
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 98 109  
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 72 138  
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 4,833 4,146  
Significant Other Observable Inputs (Level 2) | Pension Plans | Non-U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets   86  
Significant Other Observable Inputs (Level 2) | Pension Plans | Pooled Funds - Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,235 1,193  
Significant Other Observable Inputs (Level 2) | Pension Plans | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1,235 1,279  
Significant Other Observable Inputs (Level 2) | Pension Plans | Government Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 2,972 1,735  
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 618 431  
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 (43) 701  
Significant Other Observable Inputs (Level 2) | Pension Plans | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 3,547 2,867  
Significant Other Observable Inputs (Level 2) | Pension Plans | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 50    
Significant Other Observable Inputs (Level 2) | Pension Plans | Cash      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 1    
Significant Unobservable Inputs (Level 3)      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 602 924 $ 2,207
Significant Unobservable Inputs (Level 3) | Non-U.S. Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 3    
Significant Unobservable Inputs (Level 3) | Pooled Funds - Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 35 26 97
Significant Unobservable Inputs (Level 3) | Corporate Bonds And Other Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 538 665 749
Significant Unobservable Inputs (Level 3) | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 22 230 292
Significant Unobservable Inputs (Level 3) | Private Equity      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 4 3 $ 240
Significant Unobservable Inputs (Level 3) | Pension Plans      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 602 924  
Significant Unobservable Inputs (Level 3) | Pension Plans | Pooled Funds - Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 3    
Significant Unobservable Inputs (Level 3) | Pension Plans | Equity Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 3    
Significant Unobservable Inputs (Level 3) | Pension Plans | Pooled Funds - Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 35 26  
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 538 665  
Significant Unobservable Inputs (Level 3) | Pension Plans | Fixed Income Securities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 573 691  
Significant Unobservable Inputs (Level 3) | Pension Plans | Real Estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets 22 230  
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 | Other      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of pension plan assets $ 2 $ 1