Employee Benefit Plans and Postretirement Benefits - Effect of One Percentage Point Change in Assumed Healthcare Cost Trend Rates (Detail) $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($)
Compensation And Retirement Disclosure [Abstract]
Total increase/(decrease) in service cost and interest cost components of 2014 Healthcare Plan benefit expense, One Percentage-Point Increase	$ 8
Total increase/(decrease) in accumulated Healthcare benefit obligations as of end period, One Percentage-Point Increase	149
Total increase/(decrease) in service cost and interest cost components of 2014 Healthcare Plan benefit expense, One Percentage-Point Decrease	(7)
Total increase/(decrease) in accumulated Healthcare benefit obligations as of end period, One Percentage-Point Decrease	$ (121)

No definition available.

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- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (m)
-URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920

+ Details

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- Definition

Amount of effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ References

+ Details

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- Definition

The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

+ References

+ Details

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- Definition

The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs.

+ References

+ Details

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