v2.4.0.8
Pension and Other Postretirement Benefit Plans - Textual (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]      
Percentage of Company's pension projected benefit obligation that relates to international defined benefit plans 46.00% 44.00%  
Accumulated benefit obligation $ 14,800,000,000 $ 15,900,000,000  
Fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets 1,500,000,000 12,800,000,000  
Projected benefit obligations for pension plans with benefit obligations in excess of plan assets 3,000,000,000 15,500,000,000  
Fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets 1,400,000,000 6,100,000,000  
Accumulated benefit obligations for pension plans with accumulated benefit obligations in excess of plan assets 2,500,000,000 7,700,000,000  
Percentage of Company's pension investments categorized as Level 3 assets 4.00% 5.00%  
Expected annual standard deviation in returns of the target portfolio which reflects both the equity allocation and the diversification benefits among the asset classes in which the portfolio invests 13.00%    
Employer contributions to defined contribution savings plans 138,000,000 146,000,000 166,000,000
Significant Unobservable Inputs (Level 3) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 622,000,000 692,000,000 637,000,000
Pension Plans, Defined Benefit [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit cost 644,000,000 466,000,000 543,000,000
Fair Value of Plan Assets 17,435,000,000 15,349,000,000 12,481,000,000
Projected benefit obligation 16,055,000,000 17,646,000,000 14,416,000,000
Expected contributions to the pension plans and other postretirement benefit plans during next fiscal year 250,000,000    
Estimated net loss (gain) amounts that will be amortized from AOCI into net pension and postretirement benefit cost during next fiscal year 214,000,000    
Estimated prior service cost (credit) amounts that will be amortized from AOCI into net pension and postretirement benefit cost during next fiscal year (146,000,000)    
Expected rate of return on plan assets 7.50% 7.50% 7.50%
Pension Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 622,000,000 692,000,000  
Other Postretirement Benefit Plans, Defined Benefit [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit cost 72,000,000 43,000,000 122,000,000
Fair Value of Plan Assets 1,913,000,000 1,760,000,000 1,628,000,000
Projected benefit obligation 2,329,000,000 2,650,000,000 2,529,000,000
Expected contributions to the pension plans and other postretirement benefit plans during next fiscal year 75,000,000    
Estimated net loss (gain) amounts that will be amortized from AOCI into net pension and postretirement benefit cost during next fiscal year 2,000,000    
Estimated prior service cost (credit) amounts that will be amortized from AOCI into net pension and postretirement benefit cost during next fiscal year (75,000,000)    
Other Postretirement Benefit Plans, Defined Benefit [Member] | Significant Unobservable Inputs (Level 3) [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0 0  
U.S. Pension And Other Postretirement Benefit Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets 8.50% 8.70% 8.70%
U.S. Pension And Other Postretirement Benefit Plan [Member] | U.S. Equity Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Minimum percentage allocation of target investment portfolio of the Company's U.S. pension and other postretirement benefit plans 40.00%    
Maximum percentage allocation of target investment portfolio of the Company's U.S. pension and other postretirement benefit plans 60.00%    
U.S. Pension And Other Postretirement Benefit Plan [Member] | International Securities [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Minimum percentage allocation of target investment portfolio of the Company's U.S. pension and other postretirement benefit plans 20.00%    
Maximum percentage allocation of target investment portfolio of the Company's U.S. pension and other postretirement benefit plans 40.00%    
U.S. Pension And Other Postretirement Benefit Plan [Member] | Fixed Income Investments [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Minimum percentage allocation of target investment portfolio of the Company's U.S. pension and other postretirement benefit plans 15.00%    
Maximum percentage allocation of target investment portfolio of the Company's U.S. pension and other postretirement benefit plans 25.00%    
U.S. Pension And Other Postretirement Benefit Plan [Member] | Cash And Other Investments [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Maximum percentage allocation of target investment portfolio of the Company's U.S. pension and other postretirement benefit plans 5.00%    
U.S. Pension Plan, Defined Benefit [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit cost 348,000,000 268,000,000 406,000,000
Fair Value of Plan Assets 10,000,000,000 8,700,000,000  
Projected benefit obligation 8,700,000,000 10,000,000,000  
Accumulated benefit obligation $ 8,000,000,000 $ 9,000,000,000  
Minimum [Member] | U.S. Pension And Other Postretirement Benefit Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets 6.00%    
Maximum [Member] | U.S. Pension And Other Postretirement Benefit Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets 8.75%    
Scenario, Forecast [Member] | Minimum [Member] | U.S. Pension And Other Postretirement Benefit Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets 7.30%    
Scenario, Forecast [Member] | Maximum [Member] | U.S. Pension And Other Postretirement Benefit Plan [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Expected rate of return on plan assets 8.75%