Financial Instruments: (Fair Value of Derivative Contracts) (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Derivatives, Fair Value [Line Items]
Derivative assets, fair value, total gross amount derivatives contracts presented in the condensed consolidated balance sheets	$ 1,224	$ 653
Derivative assets, fair value, gross amounts not offset in the condensed consolidated balance sheets, financial instruments	(607)	(444)
Derivative assets, fair value, gross amounts not offset in the condensed consolidated balance sheets, cash collateral received / pledged	(432)	(183)
Derivative assets, fair value, net amount	185	26
Derivative liabilities, fair value	933	1,975
Derivative liabilities, fair value, gross amounts not offset in the condensed consolidated balance sheets - financial instruments	(607)	(444)
Derivative liabilities, fair value, gross amounts not offset in the condensed consolidated balance sheets - cash collateral received / pledged	(325)	(1,374)
Derivative liabilities, fair value, net amount	1	157
Foreign exchange contracts \| Foreign exchange contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAccruedLiabilitiesCurrent
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	165	499
Foreign exchange contracts \| Foreign exchange contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivatives, Fair Value [Line Items]
Derivative assets, fair value, total gross amount derivatives contracts presented in the condensed consolidated balance sheets	554	378
Foreign exchange contracts \| Foreign exchange contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Derivatives, Fair Value [Line Items]
Derivative assets, fair value, total gross amount derivatives contracts presented in the condensed consolidated balance sheets	124	107
Foreign exchange contracts \| Foreign exchange contracts \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	360	853
Foreign exchange contracts \| Not Designated as Hedging Instrument \| Balance Sheet Location [Axis]: us-gaap:OtherAccruedLiabilitiesCurrent
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	99	319
Foreign exchange contracts \| Not Designated as Hedging Instrument \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivatives, Fair Value [Line Items]
Derivative assets, fair value, total gross amount derivatives contracts presented in the condensed consolidated balance sheets	519	91
Foreign exchange contracts \| Not Designated as Hedging Instrument \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Derivatives, Fair Value [Line Items]
Derivative assets, fair value, total gross amount derivatives contracts presented in the condensed consolidated balance sheets	17	0
Foreign exchange contracts \| Not Designated as Hedging Instrument \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	140	276
Interest rate contracts \| Foreign exchange contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAccruedLiabilitiesCurrent
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	3	27
Interest rate contracts \| Foreign exchange contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivatives, Fair Value [Line Items]
Derivative assets, fair value, total gross amount derivatives contracts presented in the condensed consolidated balance sheets	10	0
Interest rate contracts \| Foreign exchange contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Derivatives, Fair Value [Line Items]
Derivative assets, fair value, total gross amount derivatives contracts presented in the condensed consolidated balance sheets	0	77
Interest rate contracts \| Foreign exchange contracts \| Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	166	0
Commodity contracts \| Foreign exchange contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAccruedLiabilitiesCurrent
Derivatives, Fair Value [Line Items]
Derivative liabilities, fair value	0	1
Commodity contracts \| Foreign exchange contracts \| Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent
Derivatives, Fair Value [Line Items]
Derivative assets, fair value, total gross amount derivatives contracts presented in the condensed consolidated balance sheets	$ 0	$ 0

Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and contract can be net settled by means outside contract or delivery of asset, subject to master netting arrangement or similar agreement and not elected or qualified to offset, deducted from derivative asset.

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