Benefit Plans: (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Amounts charged to expense for defined contribution plans	$ 123	$ 111	$ 82
Estimated contribution to pension plans	161
Net postemployment costs	$ 238	$ 213	184
Postemployment weighted-average discount rate	4.90%	4.30%
Postemployment annual weighted-average turnover rate	2.90%	2.80%
Postemployment percentage increase in assumed compensation cost	2.30%	2.40%
Assets related to postemployment cost	$ 30	$ 33
Equity Securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (as a percent)	55.00%
Debt Securities
Defined Benefit Plan Disclosure [Line Items]
Target plan asset allocations (as a percent)	45.00%
Pension
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 9,900	10,000
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	7,700	8,800
Accumulated benefit obligations in excess of plan assets, fair value of plan assets	6,200	7,200
Projected benefit obligations in excess of plan assets, project benefit obligation	8,200	9,200
Projected benefit obligations in excess of plan assets, fair value of plan assets	6,200	7,200
Accrued postemployment costs	10,456	10,567	$ 8,606
Post- employment
Defined Benefit Plan Disclosure [Line Items]
Accrued postemployment costs	$ 929	$ 915
Pension Plan Portfolio \| Benefit Obligation \| Switzerland
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	69.00%	67.00%
Pension Plan Portfolio \| Benefit Obligation \| United States
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	6.00%	6.00%
Pension Plan Portfolio \| Fair Value Of Plan Assets \| Switzerland
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	63.00%	62.00%
Pension Plan Portfolio \| Fair Value Of Plan Assets \| United States
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	6.00%	6.00%

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