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Pension and Postretirement Benefit Plans (Detail) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended
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Feb. 28, 2018 | Sep. 30, 2018
Pension Plan [Member] | U.S. [Member] | Qualified [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions from our general assets for the nine months ended September 30, 2018 |  | $ 500 | $ 500
Expected contributions from our general assets during 2018 | [1] |  | 500
Pension Plan [Member] | International [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions from our general assets for the nine months ended September 30, 2018 |  |  | 174
Expected contributions from our general assets during 2018 | [1] |  | 229
Supplemental Employee Retirement Plan [Member] | U.S. [Member] | Non-Qualified [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions from our general assets for the nine months ended September 30, 2018 |  |  | 118
Expected contributions from our general assets during 2018 | [1] |  | 137
Postretirement Plans [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions from our general assets for the nine months ended September 30, 2018 |  |  | 108
Expected contributions from our general assets during 2018 | [1] |  | $ 149
[1] | Contributions expected to be made for 2018 are inclusive of amounts contributed during the nine months ended September 30, 2018, including the $500 million voluntary contribution that was made in February 2018 for the U.S. qualified plans, which was considered pre-funding for future anticipated mandatory contributions and is also expected to reduce Pension Benefit Guaranty Corporation variable rate premiums. The U.S. supplemental (non-qualified) pension plan, international pension plan and the postretirement plan contributions from our general assets include direct employer benefit payments.

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