Organization and Basis of Presentation (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents	$ 54	$ 472
Accounts receivable	1,522	1,542
Property, plant, and equipment, net	26,157	24,499
Total Assets	39,435	45,496
LIABILITIES
Accounts payable	1,365	1,000
Short-term borrowings	361	38
Variable interest entity, primary beneficiary
ASSETS
Cash and cash equivalents	23	20
Accounts receivable	26	28
Inventories	45	107
Property, plant, and equipment, net	5	14
Notes receivable and other	67	33
Total Assets	166	202
LIABILITIES
Accounts payable	21	22
Short-term borrowings	74	38
Other current and long-term liabilities	2	4
Total liabilities	$ 97	$ 64