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Leases - Other Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Other information
Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases	$ 15	$ 13	$ 29	$ 26
Right-of-use assets obtained in exchange for lease liabilities: Operating leases	$ 18	$ 13	$ 39	$ 21
Weighted average remaining lease term (years): Operating leases	6 years 10 months 24 days		6 years 10 months 24 days		5 years 6 months
Weighted average discount rate: Operating leases	4.40%		4.40%		4.90%

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Weighted average discount rate for operating lease calculated at point in time.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of increase in right-of-use asset obtained in exchange for operating lease liability.

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