Debt - Components (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Short-term debt:
Total short-term debt	$ 363	$ 504
Long-term debt:
Senior notes, net	8,941	8,939
Other long-term debt, net	477	248
Total long-term debt	9,418	9,187
Total debt	9,781	9,691
Senior notes
Long-term debt:
Senior notes, net	8,941	8,939
Unamortized discounts and debt issuance costs	59	61
Debt instrument face value	9,000	9,000
Other
Long-term debt:
Other long-term debt, net	101	49
Level 2 | Senior notes
Long-term debt:
Debt instrument fair value	7,200	9,300
Other
Short-term debt:
Total short-term debt	126	86
Commercial Paper | Line of Credit
Short-term debt:
Short-term debt		$ 93
Weighted average interest rate, short-term (as a percentage)		2.20%
Senior Secured Hedged Inventory Facility | Senior notes
Long-term debt:
Senior notes, net	$ 177
Weighted average interest rate, long-term	1.80%
Senior Secured Hedged Inventory Facility | Line of Credit
Short-term debt:
Short-term debt	$ 237	$ 325
Weighted average interest rate, short-term (as a percentage)	1.80%	2.70%
GO Zone term loans | Term loan
Long-term debt:
Other long-term debt, net	$ 199	$ 199
Weighted average interest rate, long-term	2.50%	2.60%
Debt issuance costs	$ 1	$ 1
Senior Notes Due In February 2021 | Senior notes
Long-term debt:
Debt instrument face value	$ 600
Stated percentage	5.00%