Commitments and Contingencies (Environmental) (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Environmental [Roll Forward]
Beginning balance – January 1	$ 605	$ 565
Reductions for payments made, net of recoveries	(22)	(35)
Changes in estimates	171	99
Ending balance – September 30	754	$ 629
Loss Contingency, Range of Possible Loss, Portion Not Accrued	$ 1,066		$ 1,094

Total costs accrued as of the balance sheet date for environmental loss contingencies.

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
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Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement.

+ References

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Amount of cash outflow to settle environmental loss contingencies.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

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