Funded Status Percentage of Company's Pension Plans (Detail) - USD ($)	Dec. 31, 2016	Dec. 31, 2015
Funded status percentage of the company's pension plans
Fair value of plan assets	$ 4,501,000,000	$ 3,698,000,000
PBO	$ 5,716,000,000
Funded status percentage	79.00%
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	3,828,000,000
PBO	$ 4,296,000,000
Funded status percentage	89.00%
United States and Puerto Rico | Non Qualified Pension Plan
Funded status percentage of the company's pension plans
PBO	$ 214,000,000
Foreign Pension Plans, Defined Benefit | Qualified Pension Plan
Funded status percentage of the company's pension plans
Fair value of plan assets	673,000,000
PBO	$ 843,000,000
Funded status percentage	80.00%
Foreign Pension Plans, Defined Benefit | Non Qualified Pension Plan
Funded status percentage of the company's pension plans
PBO	$ 363,000,000