Commitments, Contingencies and Guarantees (Maximum Potential Obligation) (Details) $ in Millions	Mar. 31, 2022 USD ($)
Commitment Period Two Thousand Thirty Four [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 1,243
Commitment Period Two Thousand Thirty Five [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	2,678
Commitment Period Two Thousand Thirty Six [Member]
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	3,599
Commitment Period Two Thousand Thirty Seven
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	6,850
Commitment Period Two Thousand Thirty Eight
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	2,300
Commitment Period Two Thousand Thirty Nine
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	7,350
Commitment Period Two Thousand Forty Six
Other Commitments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 3,000