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Debt and Lines of Credit - Schedule of Long-term Debt Outstanding (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total debt	$ 7,800		$ 6,850
Net unamortized discounts, premiums and issuance costs	(59)		(52)
Total debt, including net unamortized discounts, premiums and issuance costs	7,741		6,798
Current portion of long-term debt	(500)		(550)
Long-term debt	$ 7,241		6,248
Notes due 2021 at 2.75%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	2.75%
Total debt	$ 0		550
Notes due 2022 at 1.85%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	1.85%
Total debt	$ 500		500
Notes due 2023 at 2.25%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	2.25%
Total debt	$ 500		500
Notes due 2024 at 2.625%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	2.625%
Total debt	$ 300		300
Notes due 2025 at 1.375%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	1.375%
Total debt	$ 750		750
Notes due 2026 at 1.125%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	1.125%	1.125%
Total debt	$ 500		0
Notes due 2027 at 2.90%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	2.90%
Total debt	$ 500		500
Notes due 2029 at 2.25%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	2.25%
Total debt	$ 750		750
Notes due 2030 at 1.75%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	1.75%
Total debt	$ 750		750
Notes due 2031 at 1.90%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	1.90%	1.90%
Total debt	$ 500		0
Notes due 2039 at 3.875%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	3.875%
Total debt	$ 750		750
Notes due 2048 at 4.15%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	4.15%
Total debt	$ 1,500		1,500
Notes due 2051 at 2.70%
Debt Instrument [Line Items]
Long-term debt stated interest rate (in percentage)	2.70%	2.70%
Total debt	$ 500		$ 0