Financial Instruments - Amortized Cost to Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Fair Value	$ 82,733
Gain (Loss) Accounted For Through Other Comprehensive Income (Loss)
Debt Securities, Available-for-Sale [Line Items]
Adjusted Cost	80,795	$ 85,123
Gross Unrealized Gains	505	859
Gross Unrealized Losses	(324)	(186)
Fair Value	80,976	85,796
Time deposits \| Gain (Loss) Accounted For Through Other Comprehensive Income (Loss)
Debt Securities, Available-for-Sale [Line Items]
Adjusted Cost	2,966	3,353
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	2,966	3,353
Government bonds \| Gain (Loss) Accounted For Through Other Comprehensive Income (Loss)
Debt Securities, Available-for-Sale [Line Items]
Adjusted Cost	44,465	49,087
Gross Unrealized Gains	272	443
Gross Unrealized Losses	(101)	(26)
Fair Value	44,636	49,504
Corporate debt securities \| Gain (Loss) Accounted For Through Other Comprehensive Income (Loss)
Debt Securities, Available-for-Sale [Line Items]
Adjusted Cost	18,737	18,346
Gross Unrealized Gains	124	242
Gross Unrealized Losses	(63)	(32)
Fair Value	18,798	18,556
Mortgage-backed and asset-backed securities \| Gain (Loss) Accounted For Through Other Comprehensive Income (Loss)
Debt Securities, Available-for-Sale [Line Items]
Adjusted Cost	14,627	14,337
Gross Unrealized Gains	109	174
Gross Unrealized Losses	(160)	(128)
Fair Value	$ 14,576	$ 14,383

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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