Debt (Tables)

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Summary of Short-term and Long-term Debt Outstanding

A summary of long-term debt outstanding is as follows:

(in millions)	March 31, 2021	December 31, 2020
4.0% Senior Notes, due 2025 1	695	695
2.95% Senior Notes, due 2027 2	495	495
2.5% Senior Notes, due 2029 3	496	495
1.25% Senior Notes, due 2030 4	592	592
6.55% Senior Notes, due 2037 5	290	290
4.5% Senior Notes, due 2048 6	273	273
3.25% Senior Notes, due 2049 7	589	589
2.3% Senior Notes, due 2060 8	681	681
Long-term debt	4,111	4,110

1Interest payments are due semiannually on June 15 and December 15, and as of March 31, 2021, the unamortized debt discount and issuance costs total $5 million.

2Interest payments are due semiannually on January 22 and July 22, and as of March 31, 2021, the unamortized debt discount and issuance costs total $5 million.

3Interest payments are due semiannually on June 1 and December 1, and as of March 31, 2021, the unamortized debt discount and issuance costs total $4 million.

4Interest payments are due semiannually on February 15 and August 15, beginning on February 15, 2021, and as of March 31, 2021, the unamortized debt discount and issuance costs total $8 million.

5Interest payments are due semiannually on May 15 and November 15, and as of March 31, 2021, the unamortized debt discount and issuance costs total $3 million.

6Interest payments are due semiannually on May 15 and November 15, and as of March 31, 2021, the unamortized debt discount and issuance costs total $10 million.

7Interest payments are due semiannually on June 1 and December 1, and as of March 31, 2021, the unamortized debt discount and issuance costs total $11 million.

8Interest payments are due semiannually on February 15 and August 15, beginning on February 15, 2021, and as of March 31, 2021, the unamortized debt discount and issuance costs total $19 million.