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Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Detail) - Qualified defined benefit pension plans - USD ($)
$ in Millions

Dec. 31, 2016

Dec. 31, 2015

Plans where ABO was in excess of plan assets

Projected benefit obligation

$ 44,946

$ 43,575

Less: fair value of plan assets

31,091

31,768

Unfunded status of plans

^[1]

(13,855)

(11,807)

Plans where ABO was less than plan assets

Projected benefit obligation

118

127

Less: fair value of plan assets

326

328

Funded status of plans

^[2]

$ 208

$ 201

[1]	Represents accrued pension liabilities, which are included on our consolidated balance sheets.
[2]	Represents prepaid pension assets, which are included on our consolidated balance sheets in other noncurrent assets.

X

- Definition

The unfunded or funded status of pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

No definition available.

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- Definition

Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations Less Than Plan Assets [Abstract]

+ References

No definition available.

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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations less than plan assets as of the measurement date of each statement of financial position presented.

+ References

No definition available.

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- Definition

If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations less than plan assets as of the measurement date of each statement of financial position presented.

+ References

No definition available.

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- Definition

The unfunded or funded status of pension plans with accumulated benefit obligations less than plan assets as of the measurement date of each statement of financial position presented.

+ References

No definition available.

+ Details

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- References

No definition available.

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- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920

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- Definition

If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921

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