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Funded Status Percentage of Company's Pension Plans (Detail) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Funded status percentage of the company's pension plans    
Fair value of plan assets $ 5,248,000,000 $ 4,501,000,000
PBO $ 6,159,000,000  
Funded status percentage 85.00%  
United States and Puerto Rico    
Funded status percentage of the company's pension plans    
PBO $ 0  
United States and Puerto Rico | Qualified Pension Plan    
Funded status percentage of the company's pension plans    
Fair value of plan assets 4,426,000,000  
PBO $ 4,629,000,000  
Funded status percentage 96.00%  
United States and Puerto Rico | Non Qualified Pension Plan    
Funded status percentage of the company's pension plans    
PBO $ 223,000,000  
Foreign Pension Plans, Defined Benefit | Qualified Pension Plan    
Funded status percentage of the company's pension plans    
Fair value of plan assets 822,000,000  
PBO $ 908,000,000  
Funded status percentage 91.00%  
Foreign Pension Plans, Defined Benefit | Non Qualified Pension Plan    
Funded status percentage of the company's pension plans    
PBO $ 399,000,000