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Debt (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Schedule of Debt
A summary of long-term debt outstanding is as follows:
(in millions)June 30,
2020		December 31,
2019
4.0% Senior Notes, due 2025 1
694  694  
4.4% Senior Notes, due 2026 2
894  893  
2.95% Senior Notes, due 2027 3
494  493  
2.5% Senior Notes, due 2029 4
495  495  
6.55% Senior Notes, due 2037 5
294  294  
4.5% Senior Notes, due 2048 6
490  490  
3.25% Senior Notes, due 2049 7
589  589  
Long-term debt3,950  3,948  

1Interest payments are due semiannually on June 15 and December 15, and as of June 30, 2020, the unamortized debt discount and issuance costs total $6 million.
2Interest payments are due semiannually on February 15 and August 15, and as of June 30, 2020, the unamortized debt discount and issuance costs total $6 million.
3Interest payments are due semiannually on January 22 and July 22, and as of June 30, 2020, the unamortized debt discount and issuance costs total $6 million.
4Interest payments are due semiannually on June 1 and December 1, and as of June 30, 2020, the unamortized debt discount and issuance costs total $5 million.
5Interest payments are due semiannually on May 15 and November 15, and as of June 30, 2020, the unamortized debt discount and issuance costs total $3 million.
6Interest payments are due semiannually on May 15 and November 15, and as of June 30, 2020, the unamortized debt discount and issuance costs total $10 million.
7Interest payments are due semiannually on June 1 and December 1, and as of June 30, 2020, the unamortized debt discount and issuance costs total $11 million.