NOTES PAYABLE, LONG-TERM DEBT AND AVAILABLE CREDIT FACILITIES (Schedule of Committed and Available Credit Facilities) (Details) $ in Millions	Dec. 31, 2021 USD ($)
Line of Credit Facility [Line Items]
Committed Credit	$ 8,100
Credit Available	8,100
Letters of Credit Outstanding, Amount	400
Revolving Credit Facility | Five Year Competitive Advance and Revolving Credit Facility
Line of Credit Facility [Line Items]
Committed Credit	5,000
Credit Available	5,000
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due March 2022
Line of Credit Facility [Line Items]
Committed Credit	150
Credit Available	150
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due June 2022
Line of Credit Facility [Line Items]
Committed Credit	100
Credit Available	100
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due September 2022
Line of Credit Facility [Line Items]
Committed Credit	200
Credit Available	200
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due November 2022
Line of Credit Facility [Line Items]
Committed Credit	200
Credit Available	200
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due September 2023, Facility One
Line of Credit Facility [Line Items]
Committed Credit	200
Credit Available	200
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due September 2023, Facility Two
Line of Credit Facility [Line Items]
Committed Credit	250
Credit Available	250
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due September 2023, Facility Three
Line of Credit Facility [Line Items]
Committed Credit	300
Credit Available	300
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due December 2023, Facility One
Line of Credit Facility [Line Items]
Committed Credit	300
Credit Available	300
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due December 2023, Facility Two
Line of Credit Facility [Line Items]
Committed Credit	300
Credit Available	300
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due October 2024
Line of Credit Facility [Line Items]
Committed Credit	100
Credit Available	100
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due November 2024 [Member]
Line of Credit Facility [Line Items]
Committed Credit	200
Credit Available	200
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due March 2025, Facility One
Line of Credit Facility [Line Items]
Committed Credit	100
Credit Available	100
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due March 2025, Facility Two
Line of Credit Facility [Line Items]
Committed Credit	250
Credit Available	250
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due March 2025, Facility Three
Line of Credit Facility [Line Items]
Committed Credit	350
Credit Available	350
Revolving Credit Facility | Bilateral Revolving Credit Facility, Due October 2026
Line of Credit Facility [Line Items]
Committed Credit	100
Credit Available	$ 100