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Offsetting Assets and Liabilities (Assets Subject to Netting) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives: [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset | [1] | $ 4,361 | $ 2,574
Gross amounts not offset in the consolidated balance sheets [Abstract] |  |  |
Financial instruments | [2] | (2,959) | (2,099)
Cash collateral |  | (1,244) | (403)
Securities collateral |  | (73) | (26)
Net amount |  | 85 | 46
Securities borrowed [Abstract] |  |  |
Gross amounts of recognized assets |  | 102 | 179
Gross amounts not offset in the consolidated balance sheets [Abstract] |  |  |
Financial instruments | [2] | (14) | (37)
Securities collateral |  | (85) | (139)
Net amount |  | 3 | 3
Total [Abstract] |  |  |
Gross amounts of recognized assets |  | 4,463 | 2,753
Gross amounts not offset in the consolidated balance sheets [Abstract] |  |  |
Financial instruments | [2] | (2,973) | (2,136)
Cash collateral |  | (1,244) | (403)
Securities collateral |  | (158) | (165)
Net amount |  | 88 | 49
OTC [Member] |  |  |
Derivatives: [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 4,258 | 2,525
Gross amounts not offset in the consolidated balance sheets [Abstract] |  |  |
Financial instruments | [2] | (2,933) | (2,075)
Cash collateral |  | (1,244) | (403)
Securities collateral |  | (73) | (26)
Net amount |  | 8 | 21
OTC cleared [Member] |  |  |
Derivatives: [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 21 | 34
Gross amounts not offset in the consolidated balance sheets [Abstract] |  |  |
Financial instruments | [2] | (21) | (23)
Net amount |  | 0 | 11
Exchange-traded [Member] |  |  |
Derivatives: [Abstract] |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 82 | 15
Gross amounts not offset in the consolidated balance sheets [Abstract] |  |  |
Financial instruments | [2] | (5) | (1)
Net amount |  | $ 77 | $ 14
[1] | The fair value of freestanding derivative assets is included in Other assets on the Consolidated Balance Sheets.
[2] | Represents the amount of assets that could be offset by liabilities with the same counterparty under master netting or similar arrangements that management elects not to offset on the Consolidated Balance Sheets.

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