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Debt - Components (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Short-term debt:
Total short-term debt	$ 254	$ 831
Long-term debt:
Senior notes, net	9,073	9,071
Other long-term debt, net	265	311
Total long-term debt	9,338	9,382
Total debt	9,592	10,213
Senior notes
Long-term debt:
Senior notes, net	9,073	9,071
Unamortized discounts and debt issuance costs	60	62
Debt instrument face value	9,100	9,100
Other
Long-term debt:
Other long-term debt, net	66	112
Other
Short-term debt:
Total short-term debt	117	117
Commercial Paper | Line of Credit
Short-term debt:
Short-term debt	$ 137	$ 547
Weighted average interest rate, short-term	0.60%	0.70%
Senior Secured Hedged Inventory Facility | Line of Credit
Short-term debt:
Short-term debt		$ 167
Weighted average interest rate, short-term		1.20%
GO Zone term loans | Term loan
Long-term debt:
Other long-term debt, net	$ 199	$ 199
Debt issuance costs	$ 1	$ 1
Weighted average interest rate, long-term	1.30%	1.30%
Level 2 | Senior notes
Long-term debt:
Debt instrument fair value	$ 9,500	$ 9,900

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