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Summary of Significant Accounting Policies - Interest Expense, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Interest expense	$ 696	$ 716	$ 507
Interest income	3	7	34
Interest expense, net	$ 693	$ 709	$ 473

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Amount of the cost of borrowed funds accounted for as interest expense.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
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Amount of interest revenue (income derived from investments in debt securities and on cash and cash equivalents) net of interest expense (cost of borrowed funds accounted for as interest).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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