v3.6.0.2

Postretirement Benefit Plans - Classification of Pension Plan Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Level I [Member] |  |
Major Funded Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |
Fair value of plan assets | $ 14 | $ 10
Level I [Member] | Debt Securities [Member] |  |
Major Funded Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |
Fair value of plan assets | 9 | 7
Level I [Member] | Other [Member] |  |
Major Funded Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |
Fair value of plan assets | 5 | 3
Level II [Member] |  |
Major Funded Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |
Fair value of plan assets | 143 | 152
Level II [Member] | Equity Securities [Member] |  |
Major Funded Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |
Fair value of plan assets | 48 | 49
Level II [Member] | Debt Securities [Member] |  |
Major Funded Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |
Fair value of plan assets | 72 | 81
Level II [Member] | Insurance Contracts [Member] |  |
Major Funded Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |
Fair value of plan assets | 12 | 12
Level II [Member] | Other [Member] |  |
Major Funded Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |
Fair value of plan assets | 11 | 10
Level III [Member] |  |
Major Funded Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |
Fair value of plan assets | 4 | 3
Level III [Member] | Other [Member] |  |
Major Funded Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |
Fair value of plan assets | $ 4 | $ 3

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