Financial Instruments - Short-Term Borrowings (Details) - USD ($)		Dec. 31, 2021	Dec. 31, 2020	Jun. 30, 2020
Short-term Debt [Line Items]
Commercial paper		$ 0	$ 556,000,000
Current portion of long-term debt, principal amount		1,636,000,000	2,004,000,000
Other short-term borrowings	[1]	605,000,000	145,000,000
Total short-term borrowings, principal amount		2,241,000,000	2,705,000,000
Net unamortized discounts, premiums and debt issuance costs		0	(2,000,000)
Total Short-term borrowings, including current portion of long-term debt, carried at historical proceeds, as adjusted		2,241,000,000	$ 2,703,000,000
Commercial Paper [Member]
Short-term Debt [Line Items]
Commercial paper, weighted average interest rate			0.13%
Line of Credit [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity		360,000,000
Line of credit facility, due to expire within one year		322,000,000
Line of Credit [Member] | Commercial Paper [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity				$ 4,000,000,000
Credit Facility Expiring 2025 [Member] | Line of Credit [Member] | Commercial Paper [Member]
Short-term Debt [Line Items]
Line of credit facility, maximum borrowing capacity		$ 7,000,000,000

[1] Primarily includes cash collateral. See Note 7F.