DEBT AND FINANCING ARRANGEMENTS - Credit facilities (Details) - Letter of Credit Facility - Citibank - USD ($)	Dec. 31, 2021	Mar. 31, 2021	Mar. 30, 2021	Dec. 31, 2020	Mar. 28, 2020	Dec. 24, 2019	Mar. 27, 2017	Mar. 31, 2015	Mar. 30, 2015	Nov. 20, 2013
Line of Credit Facility [Line Items]
Maximum capacity							$ 500,000,000	$ 500,000,000	$ 750,000,000	$ 750,000,000
Letters of credit outstanding	$ 356,000,000			$ 339,000,000
$500 million secured LOC
Line of Credit Facility [Line Items]
Maximum capacity						$ 500,000,000	500,000,000
$250 million secured LOC
Line of Credit Facility [Line Items]
Maximum capacity		$ 250,000,000			$ 250,000,000		$ 250,000,000
Line of credit facility, utilization capacity		150,000,000	$ 250,000,000
Line of credit facility, amount subject to administrative changes		500,000,000
$750 million secured LOC
Line of Credit Facility [Line Items]
Maximum capacity		750,000,000
Line of credit facility, aggregate utilization capacity		$ 650,000,000	$ 750,000,000