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Supplemental Other Comprehensive Income (Loss) Information - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Unrecognized pension and other retiree benefit costs, aftertax	$ 1,178	$ 1,138
Foreign currency translation adjustments	$ 3,158	$ 3,128

X

- Definition

Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

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