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Changes in Fair Value Measurements that Used Significant Unobservable Inputs (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Beginning of period	$ 4,501
End of period	5,248	$ 4,501
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Beginning of period	16	8
Purchases, sales and settlements		8
Actual return on plan assets still held at year end	2
End of period	18	16
Common/Collective Trust Funds
Defined Benefit Plan Disclosure [Line Items]
Beginning of period	900
End of period	1,174	900
Common/Collective Trust Funds | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Beginning of period	6	6
Actual return on plan assets still held at year end	2
End of period	8	6
Other Holdings
Defined Benefit Plan Disclosure [Line Items]
Beginning of period	117
End of period	142	117
Other Holdings | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Beginning of period	10	2
Purchases, sales and settlements		8
End of period	$ 10	$ 10

X

- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

+ 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 (d)(5)(iv)(02)(A)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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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.

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- Definition

Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees.

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

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- Definition

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from purchases, sales and settlements.

+ 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 (d)(5)(iv)(02)(B)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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