Investments and Fair Value Measurement - Fair Value of Unobservable Inputs (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
MLU B.V. Call Option
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	$ 0	$ 0
Total net gains (losses)
Included in earnings	(37)	0
Included in other comprehensive income (loss)	0	0
Purchases	0	0
Sales		0
Issuance	230
Transfers to Level 1	0
Ending balance	193	0
Non-marketable Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	2,341	2,370
Total net gains (losses)
Included in earnings	0	(28)
Included in other comprehensive income (loss)	2,724	2
Purchases	0	3
Sales		(6)
Issuance	0
Transfers to Level 1	(5,065)
Ending balance	0	2,341
Non-marketable equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	52	98
Total net gains (losses)
Included in earnings	553	(89)
Included in other comprehensive income (loss)	0	0
Purchases	1,677	65
Sales		(22)
Issuance	0
Transfers to Level 1	(2,250)
Ending balance	32	52
Notes Receivable
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	83	0
Total net gains (losses)
Included in earnings	(1)	(8)
Included in other comprehensive income (loss)	0	0
Purchases	50	91
Sales		0
Issuance	0
Transfers to Level 1	0
Ending balance	$ 132	$ 83

Fair Value, Assets Measured On Recurring Basis, Unobservable Input Reconciliation, Total Net Gains (Losses) [Abstract]

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Fair Value, Liabilities Measured On Recurring Basis, Unobservable Input Reconciliation, Total Net Gains (Losses)

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of transfers of financial instrument classified as a liability out of level 3 of the fair value hierarchy.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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-Section 50
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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of issuances of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from liability measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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