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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
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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.

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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 + Details
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