Summary of Significant Accounting Policies (Other Noncurrent Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Offsetting Assets [Line Items]
Other (including amounts related to VIEs)	$ 3,964	$ 3,400
Renewable Energy Program
Offsetting Assets [Line Items]
Other (including amounts related to VIEs)	$ 150	$ 150

Amount of noncurrent assets classified as other.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Name:	us-gaap_OtherAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant