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Derivative Instruments - Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivative [Line Items] |  |
Derivative assets | $ 15 | $ 10
Derivative liabilities | (75) | (100)
Other liabilities | Other Investments and Other Liabilities |  |
Derivative [Line Items] |  |
Gross Amounts of Recognized (Liabilities) | (87) | (115)
Gross Amounts Offset in the Statement of Financial Position, liabilities | (11) | (10)
Derivative liabilities | (75) | (100)
Accrued Interest and Cash Collateral (Received) | (1) | (5)
Financial Collateral (Received) | (68) | (96)
Net amount, liabilities | (8) | (9)
Other investments | Other Investments and Other Liabilities |  |
Derivative [Line Items] |  |
Asset Derivatives | 27 | 25
Gross Amounts Offset in the Statement of Financial Position, assets | 22 | 22
Derivative assets | 15 | 10
Financial Collateral Pledged | 3 | 1
Net Amount, assets | 2 | 2
Accrued Interest and Cash Collateral (Received) | $ (10) | $ (7)

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