Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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Debt and Derivative Instruments - Short-term Debt (Details) - USD ($) $ in Millions	1 Months Ended	5 Months Ended	6 Months Ended
	Jul. 31, 2022	Jun. 30, 2022	Jul. 31, 2022	Jan. 30, 2022
Debt Instrument [Line Items]
Short-term debt	$ 539		$ 539	$ 1,035
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity of credit facility	5,000	$ 3,000	5,000
Revolving Credit Facility \| Five year back up credit facility expiring December 2023
Debt Instrument [Line Items]
Maximum borrowing capacity of credit facility		$ 2,000
Expiration period		5 years
Revolving Credit Facility \| 364-day Back-up Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity of credit facility	$ 1,500	$ 1,000	1,500
Expiration period	364 days	364 days
Revolving Credit Facility \| Five Year Back Up Credit Facility Expiring July 2027
Debt Instrument [Line Items]
Maximum borrowing capacity of credit facility	$ 3,500		3,500
Expiration period	5 years
Commercial Paper
Debt Instrument [Line Items]
Maximum borrowing capacity of credit facility	$ 5,000	$ 3,000	5,000
Maximum amount outstanding during period			$ 2,700