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Debt and lines of credit
6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Debt and lines of credit Debt and lines of credit
Short-term borrowings
We maintain a line of credit to support commercial paper borrowings, if any, and to provide additional liquidity through bank loans. As of June 30, 2021, we had a variable-rate revolving credit facility from a consortium of investment-grade banks that allows us to borrow up to $2 billion until March 2024. The interest rate on borrowings under this credit facility, if drawn, is indexed to the applicable London Interbank Offered Rate (LIBOR). As of June 30, 2021, our credit facility was undrawn, and we had no commercial paper outstanding.
Long-term debt
In February 2021, we retired $550 million of maturing debt.
Long-term debt outstanding is as follows:
June 30,December 31,
20212020
Notes due 2021 at 2.75%
$ $550 
Notes due 2022 at 1.85%
500 500 
Notes due 2023 at 2.25%
500 500 
Notes due 2024 at 2.625%
300 300 
Notes due 2025 at 1.375%
750 750 
Notes due 2027 at 2.90%
500 500 
Notes due 2029 at 2.25%
750 750 
Notes due 2030 at 1.75%
750 750 
Notes due 2039 at 3.875%
750 750 
Notes due 2048 at 4.15%
1,500 1,500 
Total debt6,300 6,850 
Net unamortized discounts, premiums and issuance costs(49)(52)
Total debt, including net unamortized discounts, premiums and issuance costs6,251 6,798 
Current portion of long-term debt(499)(550)
Long-term debt$5,752 $6,248 
Interest and debt expense was $44 million and $48 million for the second quarters of 2021 and 2020, respectively, and $90 million and $93 million for the first six months of 2021 and 2020, respectively. This was net of the amortized discounts, premiums and issuance costs. Capitalized interest was not material.