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Debt (Tables)
12 Months Ended
Dec. 31, 2020
Debt Disclosure [Abstract]  
Long-term Debt
Our total debt consisted of the following (in millions):
20202019
Notes
2.50% due 2020
$ $1,250 
3.35% due 2021
500 900 
3.10% due 2023
500 500 
2.90% due 2025
750 750 
3.55% due 2026
2,000 2,000 
1.85% due 2030
400 — 
3.60% due 2035
500 500 
4.50% and 6.15% due 2036
1,054 1,054 
4.07% due 2042
1,336 1,336 
3.80% due 2045
1,000 1,000 
4.70% due 2046
1,326 1,326 
2.80% due 2050
750 — 
4.09% due 2052
1,578 1,578 
Other notes with rates from 4.85% to 9.13%, due 2022 to 2041
1,605 1,618 
Total debt13,299 13,812 
Less: unamortized discounts and issuance costs(1,130)(1,158)
Total debt, net12,169 12,654 
Less: current portion(500)(1,250)
Long-term debt, net$11,669 $11,404