Borrowings and Other Financing Instruments - Letters of Credit (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Term of letters of credit (in years)	1 year
Short-term debt	$ 0	$ 147
Letter of Credit
Line of Credit Facility [Line Items]
Short-term debt	$ 26	$ 8
Letter of Credit \| Letter of Credit
Line of Credit Facility [Line Items]
Term of letters of credit (in years)	1 year

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
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Name:	us-gaap_ShortTermBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant