Income Taxes - Schedule of Difference between Provision and U.S. Statutory Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income (loss) before income taxes, inclusive of equity in loss of affiliate	$ (15,146)	$ 753	$ 541
Taxes at the U.S. federal statutory income tax rate	(3,181)	158	114
Effect of foreign operations	183	85	103
Tax impact of partnership structure	38	124	109
Change in valuation allowances	423	135	59
Tax Cuts and Jobs Act enactment	0	0	25
Other - net	97	(26)	(8)
Provision for income taxes	$ 650	$ 476	$ 402
Actual income tax rate	(4.30%)	63.20%	74.30%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	$ 3,090	$ 0	$ 0