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Investments (Fair Values by Classification) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets
Marketable securities	$ 952	$ 4,381
Total interest-bearing securities	12,275	9,845
Available-for-sale investments [Member]
Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets
Cash and cash equivalents	11,323	5,464
Marketable securities	952	4,381
Total interest-bearing securities	$ 12,275	$ 9,845

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- Definition

Fair values of available-for-sale investments by classification in the Consolidated Balance Sheets.

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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 investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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Fair value portion 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. Also includes 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.

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