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Fair Value (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Assets
Available-for-sale investment securities	$ 569		$ 569		$ 351
Liabilities
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, before Tax	0	$ 0	0	$ 0
Fair Value, Recurring [Member]
Assets
Cash equivalents	1,490		1,490		641
Available-for-sale investment securities	569		569		351
Derivative Asset					8
Fair Value, Recurring [Member] | Level 1 [Member]
Assets
Cash equivalents	1,330		1,330		611
Available-for-sale investment securities	0		0		0
Derivative Asset					0
Fair Value, Recurring [Member] | Level 2 [Member]
Assets
Cash equivalents	160		160		30
Available-for-sale investment securities	569		569		351
Derivative Asset					8
Fair Value, Recurring [Member] | Level 3 [Member]
Assets
Cash equivalents	0		0		0
Available-for-sale investment securities	$ 0		$ 0		0
Derivative Asset					$ 0

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount, before tax and after adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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