Benefit Plans: (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Amounts charged to expense for defined contribution plans	$ 111	$ 82	$ 71
Estimated contribution to pension plans	119
Net postemployment costs	$ 213	$ 184	228
Postemployment weighted-average discount rate	4.30%	5.60%
Postemployment annual weighted-average turnover rate	2.80%	2.90%
Postemployment percentage increase in assumed compensation cost	2.40%	2.80%
Assets related to postemployment cost	$ 33	$ 30
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 Plan
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 10,000	8,200
Accumulated benefit obligations in excess of plan assets, accumulated benefit obligation	8,800	5,800
Accumulated benefit obligations in excess of plan assets, fair value of plan assets	7,200	5,000
Projected benefit obligations in excess of plan assets, project benefit obligation	9,200	6,400
Projected benefit obligations in excess of plan assets, fair value of plan assets	7,200	5,400
Accrued postemployment costs	10,567	8,606	$ 10,998
Postemployment Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Accrued postemployment costs	$ 915	$ 807
Pension Plan Portfolio \| Benefit Obligation \| Switzerland
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	67.00%	64.00%
Pension Plan Portfolio \| Benefit Obligation \| United States
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	6.00%	7.00%
Pension Plan Portfolio \| Fair Value Of Plan Assets \| Switzerland
Defined Benefit Plan Disclosure [Line Items]
Concentration risk percentage	62.00%	60.00%
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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