LONG-TERM DEBT - Detail on Long-term Debt Balances (Details) - USD ($)	Dec. 31, 2021	Sep. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Credit Facility	$ 1,050,000,000			$ 900,000,000
Finance lease obligations	146,000,000			153,000,000
Other	135,000,000			143,000,000
Long-term debt	10,138,000,000			10,376,000,000
Less current portion	(805,000,000)			(1,173,000,000)
Long-term debt, noncurrent	9,333,000,000			9,203,000,000
Series L Notes, interest rate of 3.3%, face amount of $173, maturing September 15, 2022 (effective interest rate of 3.4%)
Debt Instrument [Line Items]
Senior Notes	$ 173,000,000			173,000,000
Series L Notes, interest rate of 3.3%, face amount of $173, maturing September 15, 2022 (effective interest rate of 3.4%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	3.30%
Senior notes, face amount	$ 173,000,000
Senior notes, effective interest rate	3.40%
Series N Notes, interest rate of 3.1%, face amount of $400, redeemed August 9, 2021 (effective interest rate of 3.4%)
Debt Instrument [Line Items]
Senior Notes	$ 0			399,000,000
Series N Notes, interest rate of 3.1%, face amount of $400, redeemed August 9, 2021 (effective interest rate of 3.4%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	3.10%
Senior notes, face amount	$ 400,000,000
Senior notes, effective interest rate	3.40%
Series O Notes, interest rate of 2.9%, face amount of $450, matured March 1, 2021 (effective interest rate of 3.1%)
Debt Instrument [Line Items]
Senior Notes	$ 0			450,000,000
Series O Notes, interest rate of 2.9%, face amount of $450, matured March 1, 2021 (effective interest rate of 3.1%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	2.90%
Senior notes, face amount	$ 450,000,000
Senior notes, effective interest rate	3.10%
Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%)
Debt Instrument [Line Items]
Senior Notes	$ 347,000,000			346,000,000
Series P Notes, interest rate of 3.8%, face amount of $350, maturing October 1, 2025 (effective interest rate of 4.0%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	3.80%
Senior notes, face amount	$ 350,000,000
Senior notes, effective interest rate	4.00%
Series Q Notes, interest rate of 2.3%, face amount of $399, matured January 15, 2022 (effective interest rate of 2.5%)
Debt Instrument [Line Items]
Senior Notes	$ 399,000,000			398,000,000
Series Q Notes, interest rate of 2.3%, face amount of $399, matured January 15, 2022 (effective interest rate of 2.5%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	2.30%
Senior notes, face amount	$ 399,000,000
Senior notes, effective interest rate	2.50%
Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%)
Debt Instrument [Line Items]
Senior Notes	$ 746,000,000			745,000,000
Series R Notes, interest rate of 3.1%, face amount of $750, maturing June 15, 2026 (effective interest rate of 3.3%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	3.10%
Senior notes, face amount	$ 750,000,000
Senior notes, effective interest rate	3.30%
Series U Notes, interest rate of 3.1%, face amount of $291, maturing February 15, 2023 (effective interest rate of 3.1%)
Debt Instrument [Line Items]
Senior Notes	$ 291,000,000			291,000,000
Series U Notes, interest rate of 3.1%, face amount of $291, maturing February 15, 2023 (effective interest rate of 3.1%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	3.10%
Senior notes, face amount	$ 291,000,000
Senior notes, effective interest rate	3.10%
Series V Notes, interest rate of 3.8%, face amount of $318, maturing March 15, 2025 (effective interest rate of 2.8%)
Debt Instrument [Line Items]
Senior Notes	$ 327,000,000			330,000,000
Series V Notes, interest rate of 3.8%, face amount of $318, maturing March 15, 2025 (effective interest rate of 2.8%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	3.80%
Senior notes, face amount	$ 318,000,000
Senior notes, effective interest rate	2.80%
Series W Notes, interest rate of 4.5%, face amount of $278, maturing October 1, 2034 (effective interest rate of 4.1%)
Debt Instrument [Line Items]
Senior Notes	$ 290,000,000			290,000,000
Series W Notes, interest rate of 4.5%, face amount of $278, maturing October 1, 2034 (effective interest rate of 4.1%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	4.50%
Senior notes, face amount	$ 278,000,000
Senior notes, effective interest rate	4.10%
Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%)
Debt Instrument [Line Items]
Senior Notes	$ 445,000,000			445,000,000
Series X Notes, interest rate of 4.0%, face amount of $450, maturing April 15, 2028 (effective interest rate of 4.2%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	4.00%
Senior notes, face amount	$ 450,000,000
Senior notes, effective interest rate	4.20%
Series Z Notes, interest rate of 4.2%, face amount of $350, maturing December 1, 2023 (effective interest rate of 4.4%)
Debt Instrument [Line Items]
Senior Notes	$ 349,000,000			348,000,000
Series Z Notes, interest rate of 4.2%, face amount of $350, maturing December 1, 2023 (effective interest rate of 4.4%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	4.20%
Senior notes, face amount	$ 350,000,000
Senior notes, effective interest rate	4.40%
Series AA Notes, interest rate of 4.7%, face amount of $300, maturing December 1, 2028 (effective interest rate of 4.8%)
Debt Instrument [Line Items]
Senior Notes	$ 297,000,000			297,000,000
Series AA Notes, interest rate of 4.7%, face amount of $300, maturing December 1, 2028 (effective interest rate of 4.8%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	4.70%
Senior notes, face amount	$ 300,000,000
Senior notes, effective interest rate	4.80%
Series BB Notes, floating rate, face amount of $300, matured March 8, 2021
Debt Instrument [Line Items]
Senior Notes	$ 0			300,000,000
Series BB Notes, floating rate, face amount of $300, matured March 8, 2021 | Senior Notes
Debt Instrument [Line Items]
Senior notes, face amount	300,000,000
Series CC Notes, interest rate of 3.6%, face amount of $550, maturing April 15, 2024 (effective interest rate of 3.9%)
Debt Instrument [Line Items]
Senior Notes	$ 566,000,000			586,000,000
Series CC Notes, interest rate of 3.6%, face amount of $550, maturing April 15, 2024 (effective interest rate of 3.9%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	3.60%
Senior notes, face amount	$ 550,000,000
Senior notes, effective interest rate	3.90%
Series DD Notes, interest rate of 2.1%, face amount of $224, maturing October 3, 2022 (effective interest rate of 1.2%)
Debt Instrument [Line Items]
Senior Notes	$ 226,000,000			228,000,000
Series DD Notes, interest rate of 2.1%, face amount of $224, maturing October 3, 2022 (effective interest rate of 1.2%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	2.10%
Senior notes, face amount	$ 224,000,000
Senior notes, effective interest rate	1.20%
Series EE Notes, interest rate of 5.8%, face amount of $600, maturing May 1, 2025 (effective interest rate of 6.0%)
Debt Instrument [Line Items]
Senior Notes	$ 595,000,000			1,583,000,000
Series EE Notes, interest rate of 5.8%, face amount of $600, maturing May 1, 2025 (effective interest rate of 6.0%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	5.80%	5.75%
Senior notes, face amount	$ 600,000,000
Senior notes, effective interest rate	6.00%
Series FF Notes, interest rate of 4.6%, face amount of $1,000, maturing June 15, 2030 (effective interest rate of 4.8%)
Debt Instrument [Line Items]
Senior Notes	$ 987,000,000			986,000,000
Series FF Notes, interest rate of 4.6%, face amount of $1,000, maturing June 15, 2030 (effective interest rate of 4.8%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	4.60%
Senior notes, face amount	$ 1,000,000,000
Senior notes, effective interest rate	4.80%
Series GG Notes, interest rate of 3.5%, face amount of $1,000, maturing October 15, 2032 (effective interest rate of 3.7%)
Debt Instrument [Line Items]
Senior Notes	$ 986,000,000			985,000,000
Series GG Notes, interest rate of 3.5%, face amount of $1,000, maturing October 15, 2032 (effective interest rate of 3.7%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	3.50%
Senior notes, face amount	$ 1,000,000,000
Senior notes, effective interest rate	3.70%
Series HH Notes, interest rate of 2.9%, face amount of $1,100, maturing April 15, 2031 (effective interest rate of 3.0%)
Debt Instrument [Line Items]
Senior Notes	$ 1,090,000,000			0
Series HH Notes, interest rate of 2.9%, face amount of $1,100, maturing April 15, 2031 (effective interest rate of 3.0%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	2.90%		2.85%
Senior notes, face amount	$ 1,100,000,000		$ 1,100,000,000
Senior notes, effective interest rate	3.00%
Series II Notes, interest rate of 2.8%, face amount of $700, maturing October 15, 2033 (effective interest rate of 2.8%)
Debt Instrument [Line Items]
Senior Notes	$ 693,000,000			$ 0
Series II Notes, interest rate of 2.8%, face amount of $700, maturing October 15, 2033 (effective interest rate of 2.8%) | Senior Notes
Debt Instrument [Line Items]
Senior notes, interest rate	2.80%	2.75%
Senior notes, face amount	$ 700,000,000	$ 700,000,000
Senior notes, effective interest rate	2.80%