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DEBT AND CREDIT FACILITIES - Summary of Debt Carrying Amount (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt, net	$ 30,166	$ 31,402
Less: current portion of long-term debt and other obligations, net	2,259	2,757
Total long-term debt, net	27,907	28,645
Senior Notes and Medium-Term Notes
Debt Instrument [Line Items]
Total debt, net	$ 29,052	30,295
Senior Notes | 4.50% Senior Unsecured Notes Due April 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	4.50%
Total debt, net	$ 0	1,000
Senior Notes | 0.15% LIBOR Senior Unsecured Notes Due September 2021
Debt Instrument [Line Items]
Total debt, net	$ 500	499
Senior Notes | 0.15% LIBOR Senior Unsecured Notes Due September 2021 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	0.15%
Senior Notes | 4.40% Senior Unsecured Notes Due December 2021
Debt Instrument [Line Items]
Interest rate, stated percentage	4.40%
Total debt, net	$ 1,249	1,249
Senior Notes | 1.95% Senior Unsecured Notes Due March 2022
Debt Instrument [Line Items]
Interest rate, stated percentage	1.95%
Total debt, net	$ 499	499
Senior Notes | 3.25% Senior Unsecured Notes Due September 2022
Debt Instrument [Line Items]
Interest rate, stated percentage	3.25%
Total debt, net	$ 999	998
Senior Notes | 2.50% Senior Unsecured Notes Due September 2023
Debt Instrument [Line Items]
Interest rate, stated percentage	2.50%
Total debt, net	$ 748	748
Senior Notes | 0.52% LIBOR Senior Unsecured Notes Due September 2023
Debt Instrument [Line Items]
Total debt, net	$ 498	498
Senior Notes | 0.52% LIBOR Senior Unsecured Notes Due September 2023 | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	0.52%
Senior Notes | 0.75% Senior Unsecured Notes Due September 2023
Debt Instrument [Line Items]
Interest rate, stated percentage	0.75%
Total debt, net	$ 1,993	1,992
Senior Notes | 3.70% Senior Unsecured Notes Due April 2024
Debt Instrument [Line Items]
Interest rate, stated percentage	3.70%
Total debt, net	$ 1,746	1,746
Senior Notes | 3.50% Senior Unsecured Notes Due February 2025
Debt Instrument [Line Items]
Interest rate, stated percentage	3.50%
Total debt, net	$ 1,747	1,746
Senior Notes | 3.65% Senior Unsecured Notes Due March 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	3.65%
Total debt, net	$ 2,737	2,737
Senior Notes | 2.95% Senior Unsecured Notes Due March 2027
Debt Instrument [Line Items]
Interest rate, stated percentage	2.95%
Total debt, net	$ 1,246	1,246
Senior Notes | 1.20% Senior Unsecured Notes Due October 2027
Debt Instrument [Line Items]
Interest rate, stated percentage	1.20%
Total debt, net	$ 746	745
Senior Notes | 1.65% Senior Unsecured Notes Due October 2030
Debt Instrument [Line Items]
Interest rate, stated percentage	1.65%
Total debt, net	$ 992	992
Senior Notes | 4.60% Senior Unsecured Notes Due September 2035
Debt Instrument [Line Items]
Interest rate, stated percentage	4.60%
Total debt, net	$ 992	991
Senior Notes | 4.00% Senior Unsecured Notes Due September 2036
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%
Total debt, net	$ 742	741
Senior Notes | 2.60% Senior Unsecured Notes Due October 2040
Debt Instrument [Line Items]
Interest rate, stated percentage	2.60%
Total debt, net	$ 986	986
Senior Notes | 5.65% Senior Unsecured Notes Due December 204
Debt Instrument [Line Items]
Interest rate, stated percentage	5.65%
Total debt, net	$ 996	996
Senior Notes | 4.80% Senior Unsecured Notes Due April 2044
Debt Instrument [Line Items]
Interest rate, stated percentage	4.80%
Total debt, net	$ 1,735	1,735
Senior Notes | 4.50% Senior Unsecured Notes Due February 2045
Debt Instrument [Line Items]
Interest rate, stated percentage	4.50%
Total debt, net	$ 1,732	1,732
Senior Notes | 4.75% Senior Unsecured Notes Due March 2046
Debt Instrument [Line Items]
Interest rate, stated percentage	4.75%
Total debt, net	$ 2,219	2,219
Senior Notes | 4.15% Senior Unsecured Notes Due March 2047
Debt Instrument [Line Items]
Interest rate, stated percentage	4.15%
Total debt, net	$ 1,726	1,726
Senior Notes | 2.80% Senior Unsecured Notes Due October 2050
Debt Instrument [Line Items]
Interest rate, stated percentage	2.80%
Total debt, net	$ 1,476	1,476
Medium-term Notes | Variable Term Loan Note Due October 2023
Debt Instrument [Line Items]
Total debt, net	748	998
Notes Payable, Other Payables
Debt Instrument [Line Items]
Total debt, net	$ 1,114	$ 1,107

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