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 Obligations and Commitments Debt Obligations and Commitments (Narrative) (Details) $ in Millions, R in Billions	Apr. 14, 2020 USD ($)	Apr. 14, 2020 ZAR (R)	Mar. 21, 2020 USD ($)	Mar. 21, 2020 ZAR (R)
Short-term Debt [Line Items]
Commercial Paper			$ 2,800
Pioneer Bridge Loan Facilities [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding			$ 1,300	R 21.7
Debt Instrument, Interest Rate, Stated Percentage			7.50%	7.50%
Subsequent Event [Member]
Short-term Debt [Line Items]
Debt Instrument, Repurchase Amount	$ 360	R 6.6