Benefit Plans: (Amounts Recorded in Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Net (losses) gains	$ (2,973)	$ (3,131)	$ (2,204)
Prior service (cost) credit	55	57	50
Net transition (obligation) asset	(3)	(3)	(3)
Deferred income taxes	460	488	335
Losses to be amortized	(2,461)	(2,589)	(1,822)
Pension
Defined Benefit Plan Disclosure [Line Items]
Net (losses) gains	(2,122)	(2,325)	(1,437)
Prior service (cost) credit	75	77	70
Net transition (obligation) asset	(3)	(3)	(3)
Deferred income taxes	246	283	138
Losses to be amortized	(1,804)	(1,968)	(1,232)
Post- retirement
Defined Benefit Plan Disclosure [Line Items]
Net (losses) gains	(36)	(36)	(14)
Prior service (cost) credit	1	1	1
Net transition (obligation) asset	0	0	0
Deferred income taxes	19	19	14
Losses to be amortized	(16)	(16)	1
Post- employment
Defined Benefit Plan Disclosure [Line Items]
Net (losses) gains	(815)	(770)	(753)
Prior service (cost) credit	(21)	(21)	(21)
Net transition (obligation) asset	0	0	0
Deferred income taxes	195	186	183
Losses to be amortized	$ (641)	$ (605)	$ (591)

Deferred taxes on unrealized gains (losses) accumulated in equity that relate to benefit plans

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- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
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-Name Accounting Standards Codification
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- Definition

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

+ References

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Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

+ References

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

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- Definition

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