Investments (Equity Securities) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Equity securities	$ 767		$ 767		$ 831
Equity Securities, FV-NI, Unrealized Gain (Loss)	17	$ 135	(259)	$ 104
Equity securities without readily determinable fair value	227		227		262
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount	55		64
Fair Value, Inputs, Level 1
Debt Securities, Available-for-sale [Line Items]
Equity securities	$ 385		$ 385		$ 611

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of unrealized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 220
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Amount of investment in equity security without readily determinable fair value.

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Amount of loss from downward price adjustment on investment in equity security without readily determinable fair value.

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