Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of discretionary contributions made by an employer to a defined contribution plan.

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Cash outflows for payments of postemployment benefits (such as severance pay and health insurance benefits) recognized during the period. Postemployment benefits are benefits paid to employees after employment but before retirement.

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Expected Cash Contribution to Qualified Pension Benefits plan

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Minimum Expected Cash Contribution to Qualified Pension Benefits plan

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Number of Defined Benefit Pension Plans

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Amount of severance, pension and benefit credits or charges incurred in the period.

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Employee Benefits - Additional Information (Detail) $ in Millions			3 Months Ended		6 Months Ended
	May 31, 2016 USD ($) plan	Apr. 01, 2016 USD ($) plan	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($) plan	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($) plan	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Severance, Pension and Benefit (Credits) Charges			$ 607	$ 3,550	$ 607	$ 3,715
Pension and other postretirement benefit remeasurement (credits) charges						$ 200
Amount paid in severance benefits over the period			200		400
Post employment benefits liability			700		700
Weighted Average
Defined Benefit Plan Disclosure [Line Items]
Discount rate assumption	3.99%						4.60%
Pension and Benefit Plans \| Lump Sum Distributions
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement benefit remeasurement (credits) charges	$ 100
Number of defined benefit pension plans \| plan	3			1		1
Pension and Benefit Plans \| Defined Benefit Plan Curtailments
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement benefit remeasurement (credits) charges		$ 800
Number of defined benefit pension plans \| plan		3
Number of other postretirement benefit plans \| plan		1
Pension and Benefit Plans \| Contractual Healthcare Caps and Bargain
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement benefit remeasurement (credits) charges	$ 2,700
Number of defined benefit pension plans \| plan	2
Number of other postretirement benefit plans \| plan	3
Pension and Benefit Plans \| Charges Primarily Driven by Updated Health Care Trend Cost Assumptions
Defined Benefit Plan Disclosure [Line Items]
Pension and other postretirement benefit remeasurement (credits) charges	$ 900
Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan contributions by employer			$ 200		3,800
Defined benefit plan discretionary contributions by employer					3,400
Minimum expected cash contribution to qualified pension benefits plan					600
Expected cash contribution to qualified pension benefits plan					$ 4,000