Debt - Long Term Debt Outstanding (Details)	Jun. 30, 2021 USD ($)	Jun. 30, 2021 EUR (€)	May 31, 2021 USD ($)	Mar. 03, 2021 USD ($)	Feb. 19, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)
Debt Instrument [Line Items]
Long-term debt	$ 8,480,000,000					$ 8,216,000,000
2.5% (€650 million) senior notes due 2022
Debt Instrument [Line Items]
Debt, interest rate	2.50%	2.50%				2.50%	2.50%
Senior unsecured notes principal amount | €		€ 650,000,000					€ 650,000,000
2.5% (€650 million) senior notes due 2022 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 772,000,000					$ 798,000,000
3.6% senior notes due 2023
Debt Instrument [Line Items]
Debt, interest rate	3.60%	3.60%				3.60%	3.60%
3.6% senior notes due 2023 | Senior Notes
Debt Instrument [Line Items]
Debt, interest rate			3.60%
Senior unsecured notes principal amount			$ 500,000,000
Long-term debt	$ 496,000,000					$ 496,000,000
4.5% senior notes due 2024
Debt Instrument [Line Items]
Debt, interest rate	4.50%	4.50%				4.50%	4.50%
4.5% senior notes due 2024 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 498,000,000					$ 497,000,000
6.25% senior notes due 2025
Debt Instrument [Line Items]
Debt, interest rate	6.25%	6.25%				6.25%	6.25%
6.25% senior notes due 2025 | Senior Notes
Debt Instrument [Line Items]
Debt, interest rate	6.25%	6.25%		6.25%
Long-term debt	$ 1,031,000,000					$ 1,972,000,000
7.0% senior notes due 2025
Debt Instrument [Line Items]
Debt, interest rate	7.00%	7.00%				7.00%	7.00%
7.0% senior notes due 2025 | Senior Notes
Debt Instrument [Line Items]
Debt, interest rate	7.00%	7.00%		7.00%
Long-term debt	$ 0					$ 740,000,000
5.0% senior notes due 2026
Debt Instrument [Line Items]
Debt, interest rate	5.00%	5.00%				5.00%	5.00%
5.0% senior notes due 2026 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 745,000,000					$ 744,000,000
0% convertible senior notes due 2026
Debt Instrument [Line Items]
Debt, interest rate	0.00%	0.00%				0.00%	0.00%
0% convertible senior notes due 2026 | Convertible Debt
Debt Instrument [Line Items]
Debt, interest rate					0.00%
Senior unsecured notes principal amount	$ 1,000,000,000				$ 1,000,000,000
Long-term debt	$ 984,000,000					$ 0
4.625% senior notes due 2027
Debt Instrument [Line Items]
Debt, interest rate	4.625%	4.625%				4.625%	4.625%
4.625% senior notes due 2027 | Senior Notes
Debt Instrument [Line Items]
Debt, interest rate			4.625%
Senior unsecured notes principal amount			$ 750,000,000
Long-term debt	$ 744,000,000					$ 743,000,000
3.8% senior notes due 2028
Debt Instrument [Line Items]
Debt, interest rate	3.80%	3.80%				3.80%	3.80%
3.8% senior notes due 2028 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 993,000,000					$ 993,000,000
3.25% senior notes due 2030
Debt Instrument [Line Items]
Debt, interest rate	3.25%	3.25%				3.25%	3.25%
3.25% senior notes due 2030 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	$ 1,234,000,000					$ 1,233,000,000
2.95% senior notes due 2031
Debt Instrument [Line Items]
Debt, interest rate	2.95%	2.95%				2.95%	2.95%
2.95% senior notes due 2031 | Senior Notes
Debt Instrument [Line Items]
Debt, interest rate			2.95%	2.95%
Senior unsecured notes principal amount				$ 1,000,000,000
Long-term debt	$ 983,000,000					$ 0