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Changes in Fair Value of Level 3 Plan Assets (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning Balance | $ 231 | $ 61
Realized losses, net | (6) | (12)
Unrealized gains, net | 3 | 7
Purchases, sales and settlements, net | (207) | (22)
Transfers into (out of) Level 3, net | 5 | 197
Ending Balance | 26 | 231
Private equity funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning Balance | 200 |
Purchases, sales and settlements, net | (200) |
Transfers into (out of) Level 3, net |  | 200
Ending Balance |  | 200
Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Beginning Balance | 31 | 61
Realized losses, net | (6) | (12)
Unrealized gains, net | 3 | 7
Purchases, sales and settlements, net | (7) | (22)
Transfers into (out of) Level 3, net | 5 | (3)
Ending Balance | $ 26 | $ 31

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- Definition This element represents the amount of gains or losses realized on sales of plan assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
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- Definition This element represents the amount of unrealized gains or losses on plan assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. + References No definition available. + Details
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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 purchases, (sales), issuances and (settlements) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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