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Long-term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020	May 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 6,975	$ 3,548
Issuance costs and discounts, net	(46)	(248)
Total debt	6,929	3,300
Current portion of long-term debt	244	140
Long-term debt	6,685	3,160
Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 5,380	2,060
3.450% senior notes due 2021
Debt Instrument [Line Items]
Stated interest rate	3.45%
3.450% senior notes due 2021 \| Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 0	140
3.950% senior notes due 2022
Debt Instrument [Line Items]
Stated interest rate	3.95%
3.950% senior notes due 2022 \| Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 244	244
0.550% senior notes due 2023
Debt Instrument [Line Items]
Stated interest rate	0.55%
0.550% senior notes due 2023 \| Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 750	0
0.750% senior callable notes due 2024
Debt Instrument [Line Items]
Stated interest rate	0.75%
0.750% senior callable notes due 2024 \| Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 750	0
0.250% convertible senior notes due 2025
Debt Instrument [Line Items]
Stated interest rate	0.25%
Issuance costs and discounts, net	$ 17
0.250% convertible senior notes due 2025 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate			0.25%
Long-term debt	$ 1,323	1,323
1.125% senior notes due 2026
Debt Instrument [Line Items]
Stated interest rate	1.125%
1.125% senior notes due 2026 \| Senior notes
Debt Instrument [Line Items]
Stated interest rate	1.125%
Long-term debt	$ 750	0
4.450% senior notes due 2026
Debt Instrument [Line Items]
Stated interest rate	4.45%
4.450% senior notes due 2026 \| Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 500	500
5.625% senior notes due 2027
Debt Instrument [Line Items]
Stated interest rate	5.625%
5.625% senior notes due 2027 \| Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 179	0
7.200% senior notes due 2028
Debt Instrument [Line Items]
Stated interest rate	7.20%
7.200% senior notes due 2028 \| Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 241	241
4.125% senior notes due 2028
Debt Instrument [Line Items]
Stated interest rate	4.125%
4.125% senior notes due 2028 \| Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 138	0
1.900% senior notes due 2030
Debt Instrument [Line Items]
Stated interest rate	1.90%
1.900% senior notes due 2030 \| Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 1,100	1,100
2.150% senior notes due 2031
Debt Instrument [Line Items]
Stated interest rate	2.15%
2.150% senior notes due 2031 \| Senior notes
Debt Instrument [Line Items]
Long-term debt	$ 1,000	$ 0