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Summary of Significant Accounting Policies - Interest Expense, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Interest expense	$ 716	$ 507	$ 193
Interest income	$ 7	$ 34	$ 4

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

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-Publisher FASB
-Name Accounting Standards Codification
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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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