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Postretirement Benefit Plans - Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets (Detail) - Qualified Defined Benefit Pension Plans - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Plans where ABO was in excess of plan assets |  |
Projected benefit obligation | $ 48,628 | $ 44,946
Less: fair value of plan assets | 32,925 | 31,091
Unfunded status of plans | (15,703) | (13,855)
Plans where ABO was less than plan assets |  |
Projected benefit obligation | 58 | 118
Less: fair value of plan assets | 170 | 326
Funded status of plans | $ 112 | $ 208

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- 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. + Details
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- Definition Defined Benefit Plan Pension Plans With Accumulated Benefit Obligations Less Than Plan Assets [Abstract] + References No definition available. + Details
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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. + Details
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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. + Details
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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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- Definition Fair value of plan assets for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + 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=82843861&loc=d3e2417-114920 + Details
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- Definition Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets. + 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=77993564&loc=d3e4179-114921 + Details
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