Debt - Summary of outstanding debt (Details)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 02, 2021 USD ($)	Aug. 23, 2021 USD ($)	Jan. 13, 2021 USD ($)	Dec. 31, 2020 USD ($)	May 12, 2020 USD ($)
Debt Instrument [Line Items]
Total debt	$ 9,392,000,000					$ 7,729,000,000
Less: Short-term debt and current portion of long-term debt	1,164,000,000					448,000,000
Total long-term debt	8,228,000,000					7,281,000,000
Other
Debt Instrument [Line Items]
Total debt	$ 0					48,000,000
2.80% Senior Notes due March 2021 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	2.80%	2.80%			2.80%
Total debt	$ 0					400,000,000
Debt face value					$ 400,000,000
2.20% Senior Notes due November 2022 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	2.20%	2.20%
Total debt	$ 499,000,000					498,000,000
4.00% Senior Notes due November 2023 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	4.00%	4.00%
Total debt	$ 349,000,000					349,000,000
3.50% Senior Notes due June 2024 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	3.50%	3.50%
Total debt	$ 598,000,000					597,000,000
3.875% Senior Notes due December 2025 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	3.875%	3.875%
Total debt	$ 748,000,000					747,000,000
2.875% Senior Notes due May 2026 (EUR 500M) | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	2.875%	2.875%
Total debt	$ 563,000,000					606,000,000
Debt face value | €		€ 500,000,000
8.205% Junior Subordinated Notes due January 2027 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	8.205%	8.205%
Total debt	$ 521,000,000					521,000,000
4.50% Senior Notes due December 2028 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	4.50%	4.50%
Total debt	$ 347,000,000					347,000,000
3.75% Senior Notes due May 2029 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	3.75%	3.75%
Total debt	$ 745,000,000					744,000,000
2.80% Senior Notes due May 2030 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	2.80%	2.80%					2.80%
Total debt	$ 993,000,000					992,000,000
Debt face value							$ 1,000,000,000
2.05% Senior Notes due August 2031 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	2.05%	2.05%		2.05%
Total debt	$ 396,000,000					0
Debt face value				$ 400,000,000
2.60% Senior Notes due December 2031 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	2.60%	2.60%	2.60%
Total debt	$ 496,000,000					0
Debt face value			$ 500,000,000
6.25% Senior Notes due September 2040 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	6.25%	6.25%
Total debt	$ 296,000,000					296,000,000
4.25% Senior Notes due December 2042 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	4.25%	4.25%
Total debt	$ 201,000,000					200,000,000
4.45% Senior Notes due May 2043 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	4.45%	4.45%
Total debt	$ 247,000,000					247,000,000
4.60% Senior Notes due June 2044 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	4.60%	4.60%
Total debt	$ 544,000,000					544,000,000
4.75% Senior Notes due May 2045 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	4.75%	4.75%
Total debt	$ 593,000,000					593,000,000
2.90% Senior Notes due August 2051 | Senior Notes
Debt Instrument [Line Items]
Interest rate on debt	2.90%	2.90%		2.90%
Total debt	$ 591,000,000					0
Debt face value				$ 600,000,000
Commercial paper
Debt Instrument [Line Items]
Total debt	$ 665,000,000					$ 0