Benefit Plans: (Amounts Recorded in Accumulated Other Comprehensive Losses) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Net (losses) gains	$ (3,131)	$ (2,204)	$ (3,443)
Prior service (cost) credit	57	50	50
Net transition (obligation) asset	(3)	(3)	(3)
Deferred income taxes	488	335	516
Losses to be amortized	(2,589)	(1,822)	(2,880)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net (losses) gains	(2,325)	(1,437)	(2,495)
Prior service (cost) credit	77	70	71
Net transition (obligation) asset	(3)	(3)	(3)
Deferred income taxes	283	138	278
Losses to be amortized	(1,968)	(1,232)	(2,149)
Postretirement
Defined Benefit Plan Disclosure [Line Items]
Net (losses) gains	(36)	(14)	(64)
Prior service (cost) credit	1	1	1
Net transition (obligation) asset	0	0	0
Deferred income taxes	19	14	24
Losses to be amortized	(16)	1	(39)
Postemployment Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Net (losses) gains	(770)	(753)	(884)
Prior service (cost) credit	(21)	(21)	(22)
Net transition (obligation) asset	0	0	0
Deferred income taxes	186	183	214
Losses to be amortized	$ (605)	$ (591)	$ (692)

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

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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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- Definition

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.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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