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Pension and Postretirement Benefit Plans (Detail) - USD ($) $ in Millions		1 Months Ended	9 Months Ended
		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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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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