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Contingencies and Commitments - Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Right-of-use assets	$ 424		$ 423
Lease liabilities, current	109		109
Lease liabilities, non-current	$ 322		$ 325
Other information:
Weighted-average remaining lease term	5 years 9 months 18 days		5 years 7 months 6 days
Weighted-average discount rate	2.94%		2.57%
Operating lease cost	$ 36	$ 36

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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 55
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Present value of lessee's discounted obligation for lease payments from operating lease, classified as current.

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Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent.

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Amount of lessee's right to use underlying asset under operating lease.

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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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