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Fair Value (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Assets
Available-for-sale investment securities	$ 1,318,000,000		$ 1,318,000,000		$ 1,137,000,000
OCI, debt securities, available-for-sale, gain (loss), after adjustment, before Tax	0	$ 0	0	$ 0
Fair Value, Recurring
Assets
Cash equivalents	1,840,000,000		1,840,000,000		1,460,000,000
Available-for-sale investment securities	1,318,000,000		1,318,000,000		1,137,000,000
Fair Value, Recurring | Level 1
Assets
Cash equivalents	1,740,000,000		1,740,000,000		1,330,000,000
Available-for-sale investment securities	0		0		0
Fair Value, Recurring | Level 2
Assets
Cash equivalents	100,000,000		100,000,000		130,000,000
Available-for-sale investment securities	1,318,000,000		1,318,000,000		1,137,000,000
Fair Value, Recurring | Level 3
Assets
Cash equivalents	0		0		0
Available-for-sale investment securities	$ 0		$ 0		$ 0

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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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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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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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