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Securities Financing Activities (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Securities Financing Transaction [Line Items] |  |
Reverse repurchase agreements | $ 0 | $ 0
Securities borrowed | 0 | 0
Total | 0 | 0
Repurchase agreements | 0 | 0
Total | 0 | 0
Collateral |  |
Securities Financing Transaction [Line Items] |  |
Reverse repurchase agreements | (5) | 0
Securities borrowed | 0 | (500)
Total | (5) | (500)
Repurchase agreements | (268) | (214)
Total | (268) | (214)
Federal Agency CMOs |  |
Securities Financing Transaction [Line Items] |  |
Assets pledged as collateral | 307 |
Liabilities pledged as collateral | 268 |
Gross Amount Presented in Balance Sheet |  |
Securities Financing Transaction [Line Items] |  |
Reverse repurchase agreements | 18 | 6
Securities borrowed | 0 | 500
Total | 18 | 506
Repurchase agreements | 281 | 220
Total | 281 | 220
Netting Adjustments |  |
Securities Financing Transaction [Line Items] |  |
Reverse repurchase agreements | (13) | (6)
Securities borrowed | 0 | 0
Total | (13) | (6)
Repurchase agreements | (13) | (6)
Total | $ (13) | $ (6)

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