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DEBT (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Summary of Outstanding Debt
Outstanding debt at March 31, 2021 consists of the following (in millions): 
March 31, 2021
Outstanding
 Principal 
Amount
Unamortized Debt
Discount and Debt
Issuance Cost
Carrying
 Value
Current liabilities:
0.9% Convertible Senior Notes due September 2021
$1,000 $(9)$991 
0.8% (€1 billion) Senior Notes due March 2022
1,175 (2)1,173 
4.1% Senior Notes due April 2025
1,000 (4)996 
4.5% Senior Notes due April 2027
750 (5)745 
Total short-term debt$3,925 $(20)$3,905 
Long-term debt:
2.15% (€750 million) Senior Notes due November 2022
$881 $(2)$879 
2.75% Senior Notes due March 2023
500 (1)499 
2.375% (€1 billion) Senior Notes due September 2024
1,175 (6)1,169 
3.65% Senior Notes due March 2025
500 (2)498 
0.1% (€950 million) Senior Notes due March 2025
1,118 (6)1,112 
0.75% Convertible Senior Notes due May 2025
863 (121)742 
3.6% Senior Notes due June 2026
1,000 (4)996 
1.8% (€1 billion) Senior Notes due March 2027
1,175 (3)1,172 
3.55% Senior Notes due March 2028
500 (2)498 
0.5% (€750 million) Senior Notes due March 2028
881 (5)876 
4.625% Senior Notes due April 2030
1,500 (11)1,489 
Total long-term debt$10,093 $(163)$9,930 
 
Outstanding debt at December 31, 2020 consists of the following (in millions): 
December 31, 2020Outstanding
 Principal 
Amount		Unamortized Debt
Discount and Debt
Issuance Cost
Carrying
 Value
Current Liabilities:
0.9% Convertible Senior Notes due September 2021
$1,000 $(15)$985 
Long-term debt:
0.8% (€1 billion) Senior Notes due March 2022
$1,223 $(1)$1,222 
2.15% (€750 million) Senior Notes due November 2022
919 (4)915 
2.75% Senior Notes due March 2023
500 (1)499 
2.375% (€1 billion) Senior Notes due September 2024
1,223 (7)1,216 
3.65% Senior Notes due March 2025
500 (2)498 
4.1% Senior Notes due April 2025
1,000 (5)995 
0.75% Convertible Senior Notes due May 2025
863 (128)735 
3.6% Senior Notes due June 2026
1,000 (4)996 
1.8% (€1 billion) Senior Notes due March 2027
1,223 (2)1,221 
4.5% Senior Notes due April 2027
750 (5)745 
3.55% Senior Notes due March 2028
500 (2)498 
4.625% Senior Notes due April 2030
1,500 (11)1,489 
Total long-term debt$11,201 $(172)$11,029 
Summary of Interest Expense
The following table summarizes the interest expenses and weighted-average effective interest rates related to the convertible senior notes (in millions, except for interest rates). The remaining period for amortization of debt discount and debt issuance costs is the period until the stated maturity date for the respective debt.

For the Three Months Ended March 31,
20212020
Coupon interest expense$4 $3 
Amortization of debt discount and debt issuance costs14 12 
Total interest expenses$18 $15 
Weighted-average effective interest rate3.9 %3.2 %
The following table summarizes the interest expenses related to other senior notes (in millions):
For the Three Months Ended March 31,
20212020
Coupon interest expense$78$40
Amortization of debt discount and debt issuance costs22
Total interest expenses$80$42
Schedule of other senior notes The following table summarizes the information related to other senior notes outstanding at March 31, 2021:
Other Senior NotesDate of Issuance
Effective Interest Rate (1)
Timing of Interest Payments
0.8% Senior Notes due March 2022
March 20170.94 %Annually in March
2.15% Senior Notes due November 2022
November 20152.27 %Annually in November
2.75% Senior Notes due March 2023
August 20172.88 %Semi-annually in March and September
2.375% Senior Notes due September 2024
September 20142.54 %Annually in September
3.65% Senior Notes due March 2025
March 20153.76 %Semi-annually in March and September
0.1% Senior Notes due March 2025
March 20210.30 %Annually in March
4.1% Senior Notes due April 2025 (2)
April 20204.22 %Semi-annually in April and October
3.6% Senior Notes due June 2026
May 20163.70 %Semi-annually in June and December
1.8% Senior Notes due March 2027
March 20151.86 %Annually in March
4.5% Senior Notes due April 2027 (2)
April 20204.63 %Semi-annually in April and October
3.55% Senior Notes due March 2028
August 20173.63 %Semi-annually in March and September
0.5% Senior Notes due March 2028
March 20210.63 %Annually in March
4.625% Senior Notes due April 2030
April 20204.72 %Semi-annually in April and October
(1) Represents the coupon interest rate adjusted for deferred debt issuance costs, premiums or discounts existing at the origination of the debt.
(2) These Senior Notes were redeemed in April 2021 as disclosed above.