Organization and Basis of Presentation (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
ASSETS
Cash and cash equivalents	$ 1,568	$ 514
Accounts receivable	1,553	1,665
Property, plant, and equipment, net	28,272	27,969
Goodwill	2,466	2,466
Total Assets	46,699	45,496
LIABILITIES
Short-term borrowings	52	38
Total
ASSETS
Cash and cash equivalents	44	54
Accounts receivable	31	36
Inventories	52	107
Property, plant, and equipment, net	419	425
Goodwill	25	25
Intangible assets	524	527
Other current and long-term assets	48	35
Total Assets	1,143	1,209
LIABILITIES
Accounts payable and accrued current liabilities	19	22
Short-term borrowings	52	38
Other current and long-term liabilities	11	11
Total liabilities	82	71
SGG
ASSETS
Cash and cash equivalents	21	34
Accounts receivable	9	8
Inventories	0	0
Property, plant, and equipment, net	400	402
Goodwill	25	25
Intangible assets	524	527
Other current and long-term assets	1	2
Total Assets	980	998
LIABILITIES
Accounts payable and accrued current liabilities	0	0
Short-term borrowings	0	0
Other current and long-term liabilities	7	7
Total liabilities	$ 7	$ 7
VIE ownership and non-ownership percentage	100.00%
VIE ownership percentage	85.00%	85.00%
Other
ASSETS
Cash and cash equivalents	$ 23	$ 20
Accounts receivable	22	28
Inventories	52	107
Property, plant, and equipment, net	19	23
Goodwill	0	0
Intangible assets	0	0
Other current and long-term assets	47	33
Total Assets	163	211
LIABILITIES
Accounts payable and accrued current liabilities	19	22
Short-term borrowings	52	38
Other current and long-term liabilities	4	4
Total liabilities	$ 75	$ 64