Cash, Cash Equivalents And Debt Available-For-Sale Securities, Amortized Cost Basis [Abstract]

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Cash, Cash Equivalents, And Marketable Securities

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Cash, Cash Equivalents, And Marketable Securities, Amortized Cost Basis

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Cash, Cash Equivalents, And Marketable Securities, Excluding Restricted Cash And Investments

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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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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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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Amount of unrealized and realized 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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Cash and investments whose use in whole or in part is restricted for the long-term, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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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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Financial Instruments - Fair Values on Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Schedule of Investments [Line Items]
Equity Securities, FV-NI, Unrealized Gain (Loss)	$ 235	$ 14	$ 204	$ 82
Recurring
Schedule of Investments [Line Items]
Cash	9,277		9,277		$ 9,776
Total Estimated Fair Value
Cash, cash equivalents and marketable securities	71,769		71,769		55,342
Less: Restricted cash, cash equivalents, and marketable securities	(378)		(378)		(321)
Total cash, cash equivalents, and marketable securities	71,391		71,391		55,021
Cost or Amortized Cost
Cash, cash equivalents and marketable securities	71,045		71,045
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax
Debt Securities, Available for Sale, Unrealized Gain	338		338
Debt Securities, Available for Sale, Unrealized Loss	(25)		(25)
Recurring \| Level 1 securities
Total Estimated Fair Value
Equity Securities, FV-NI	407		407		202
Recurring \| Level 1 securities \| Money market funds
Schedule of Investments [Line Items]
Money market funds	21,818		21,818		18,850
Recurring \| Level 2 securities
Total Estimated Fair Value
Equity Securities, FV-NI	4		4		5
Recurring \| Level 2 securities \| Foreign government and agency securities
Total Estimated Fair Value
Debt Securities, Available for Sale, Fair Value	6,325		6,325		4,794
Cost or Amortized Cost
Debt Securities, Available for Sale, Cost	6,324		6,324
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax
Debt Securities, Available for Sale, Unrealized Gain	1		1
Debt Securities, Available for Sale, Unrealized Loss	0		0
Recurring \| Level 2 securities \| U.S. government and agency securities
Total Estimated Fair Value
Debt Securities, Available for Sale, Fair Value	8,123		8,123		7,080
Cost or Amortized Cost
Debt Securities, Available for Sale, Cost	8,087		8,087
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax
Debt Securities, Available for Sale, Unrealized Gain	37		37
Debt Securities, Available for Sale, Unrealized Loss	(1)		(1)
Recurring \| Level 2 securities \| Corporate debt securities
Total Estimated Fair Value
Debt Securities, Available for Sale, Fair Value	22,045		22,045		11,881
Cost or Amortized Cost
Debt Securities, Available for Sale, Cost	21,785		21,785
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax
Debt Securities, Available for Sale, Unrealized Gain	271		271
Debt Securities, Available for Sale, Unrealized Loss	(11)		(11)
Recurring \| Level 2 securities \| Asset-backed securities
Total Estimated Fair Value
Debt Securities, Available for Sale, Fair Value	3,287		3,287		2,360
Cost or Amortized Cost
Debt Securities, Available for Sale, Cost	3,277		3,277
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax
Debt Securities, Available for Sale, Unrealized Gain	23		23
Debt Securities, Available for Sale, Unrealized Loss	(13)		(13)
Recurring \| Level 2 securities \| Other fixed income securities
Total Estimated Fair Value
Debt Securities, Available for Sale, Fair Value	483		483		$ 394
Cost or Amortized Cost
Debt Securities, Available for Sale, Cost	477		477
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax
Debt Securities, Available for Sale, Unrealized Gain	6		6
Debt Securities, Available for Sale, Unrealized Loss	0		0
Money market funds \| Recurring \| Level 1 securities \| Money market funds
Schedule of Investments [Line Items]
Money market funds	$ 21,818		$ 21,818