Financial Instruments - Investment Securities (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Equity securities, amortized cost	$ 76	$ 17
Equity securities, gross unrealized gain	1,431	8
Equity securities, gross unrealized loss	(5)	(1)
Equity securities, estimated fair value	1,502	24
Total, amortized cost	106	274
Debt and equity securities unrealized gain	1,431	10
Debt and equity securities, gross unrealized losses	(5)	(1)
Total, estimated fair value	1,532	283
Net unrealized gain (loss)	1,417	0	$ 0
Non-U.S. debt securities
Debt Securities, Available-for-sale [Line Items]
Debt securities, amortized cost	30	257
Debt securities, gross unrealized gains	0	2
Debt securities, gross unrealized losses	0	0
Debt securities, estimated fair value	$ 30	$ 259
Debt securities, term	2 years

Debt and Equity Securities, Unrealized Gain

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Debt and Equity Securities, Unrealized Loss

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Investments, Fair Value Disclosure, Amortized Cost

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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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Amount, before tax, of unrealized loss 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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Amortized cost of 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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Amount of 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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Period between issuance and maturity of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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

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Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

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Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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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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Amount of unrealized 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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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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