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Employee Benefit Plans - Sumamry of Balance Sheet Components (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Consolidated Balance Sheet for pension and other postretirement benefit plans
Noncurrent employee benefit plans	$ (6,654)	$ (7,421)
Pension Benefits | United States
Consolidated Balance Sheet for pension and other postretirement benefit plans
Deferred charges and other assets	17	21
Accrued liabilities	(180)	(188)
Noncurrent employee benefit plans	(3,031)	(3,465)
Net amount recognized at December 31	(3,194)	(3,632)
Pension Benefits | Int’l.
Consolidated Balance Sheet for pension and other postretirement benefit plans
Deferred charges and other assets	412	448
Accrued liabilities	(66)	(100)
Noncurrent employee benefit plans	(1,024)	(1,122)
Net amount recognized at December 31	(678)	(774)
Other Benefits
Consolidated Balance Sheet for pension and other postretirement benefit plans
Deferred charges and other assets	0	0
Accrued liabilities	(175)	(174)
Noncurrent employee benefit plans	(2,255)	(2,614)
Net amount recognized at December 31	$ (2,430)	$ (2,788)

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- Definition

Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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