Organization and Basis of Presentation (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents	$ 3,448	$ 514
Accounts receivable	1,550	1,665
Property, plant, and equipment, net	29,140	27,969
Goodwill	2,466	2,466
Total Assets	49,636	45,496
LIABILITIES
Accounts payable	1,173	1,029
Short-term borrowings	69	38
Total
ASSETS
Cash and cash equivalents	49	54
Accounts receivable	33	36
Inventories	46	107
Property, plant, and equipment, net	415	425
Goodwill	25	25
Intangible assets	520	527
Notes receivable and other	62	35
Total Assets	1,150	1,209
LIABILITIES
Accounts payable	23	22
Short-term borrowings	69	38
Other current and long-term liabilities	9	11
Total liabilities	101	71
SGG
ASSETS
Cash and cash equivalents	27	34
Accounts receivable	9	8
Inventories	0	0
Property, plant, and equipment, net	398	402
Goodwill	25	25
Intangible assets	520	527
Notes receivable and other	2	2
Total Assets	981	998
LIABILITIES
Accounts payable	1	0
Short-term borrowings	0	0
Other current and long-term liabilities	7	7
Total liabilities	$ 8	$ 7
VIE ownership and non-ownership percentage	100.00%
VIE ownership percentage	85.00%	85.00%
Other
ASSETS
Cash and cash equivalents	$ 22	$ 20
Accounts receivable	24	28
Inventories	46	107
Property, plant, and equipment, net	17	23
Goodwill	0	0
Intangible assets	0	0
Notes receivable and other	60	33
Total Assets	169	211
LIABILITIES
Accounts payable	22	22
Short-term borrowings	69	38
Other current and long-term liabilities	2	4
Total liabilities	$ 93	$ 64