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BORROWINGS AND LINES OF CREDIT - Narrative (Details) - USD ($)		1 Months Ended	12 Months Ended
	Feb. 10, 2020	Feb. 28, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Issuance of long-term debt			$ 140,000,000	$ 11,784,000,000	$ 107,000,000
Repayment of long-term debt			$ 704,000,000	1,911,000,000	$ 138,000,000
Weighted average interest rate			2.80%
Interest expense, debt			$ 319,000,000	298,000,000
Amortization of debt issuance costs			$ 10,000,000	9,000,000
Interest expense, debt, financing fees expensed				5,000,000
Weighted Average
Debt Instrument [Line Items]
Average maturity of long-term debt			12 years
Other Debt | Project Financing Arrangements
Debt Instrument [Line Items]
Issuance of long-term debt			$ 124,000,000	135,000,000
Repayment of long-term debt			181,000,000	$ 161,000,000
Unsecured Debt | 1.923% Notes due February 15, 2023
Debt Instrument [Line Items]
Prepayment amount		$ 17,000,000	17,000,000
Interest expense, debt, financing fees expensed		$ 2,000,000	2,000,000
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity	$ 2,000,000,000
Commitment fee percentage	0.125%
Long-term debt			$ 0
Revolving Credit Facility | Sterling Overnight Index Average | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate			0.0326%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate			1.25%
Commercial Paper | Line of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 2,000,000,000
Short-term debt			$ 0

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