Amounts Expected to be Amortized from AOCI to Net Periodic Benefit Cost in 2018 (Detail) $ in Millions	Dec. 31, 2017 USD ($)
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss/(gain)	$ 174
Prior service credit and transition obligation	(1)
Total pre-tax amount expected to be amortized from AOCI to net pension and OPEB cost in 2018	173
OPEB
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss/(gain)	(10)
Prior service credit and transition obligation	(15)
Total pre-tax amount expected to be amortized from AOCI to net pension and OPEB cost in 2018	$ (25)

Defined benefit plan amortization of net prior service cost credit and transition obligation.

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of cost (credit) included in accumulated other comprehensive (income) loss expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position.

+ 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 (s)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Amount included in accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan expected to be recognized in net periodic benefit (cost) credit for fiscal year following most recent annual statement of financial position.

+ References

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