Retirement and Other Benefit Programs - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 31, 2014	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Reduction to pension and OPEB obligation in remeasurement			$ 220,000,000
Accumulated benefit obligation of company's pension plans				$ 5,400,000,000	$ 5,100,000,000
Expected return on plan assets assumption rate for 2017				6.50%
General investment portfolio limits on holdings, description				5.00%
Defined benefit obligation in 2017				$ 5,716,000,000
Defined contribution plan, contributions by employer				$ 50,000,000	$ 46,000,000	$ 54,000,000
Minimum
Defined Benefit Plan Disclosure [Line Items]
Allowed variance from target allocation of plan assets				2.00%
Maximum
Defined Benefit Plan Disclosure [Line Items]
Allowed variance from target allocation of plan assets				5.00%
Return-Seeking Investments
Defined Benefit Plan Disclosure [Line Items]
Target allocation for plan assets				53 percent
Liability Hedging Investments
Defined Benefit Plan Disclosure [Line Items]
Target allocation for plan assets				46 percent
Postemployment medical benefits
Defined Benefit Plan Disclosure [Line Items]
Retirees minimum qualifying age	65 years
Postemployment benefit obligation re-measured, discount rate used	4.30%
Reduction to postemployment benefit obligation due to plan amendment	$ (124,000,000)
Actuarial loss for the change in discount	44,000,000
Reduction to postemployment benefit obligation due to plan amendment, amount recognized in AOCI	$ 80,000,000
Reduction to postemployment benefit obligation due to plan amendment, amortization period	11 years
U.S. Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Contribution of the company in employee deferred contribution plan		$ 706,000,000
Defined benefit obligation in 2017				$ 0
Pension And Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected cash outflow relating to OPEB in 2017				19,000,000
Puerto Rico Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Minimum expected equity contribution to pension plans in 2017				20,000,000
Foreign Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Minimum expected equity contribution to pension plans in 2017				$ 40,000,000