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Derivatives - Offsetting Derivative Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Asset Derivatives [1]	$ 31	$ 25
Derivative assets	7	10
Gross Amounts of Recognized (Liabilities)	(92)	(115)
Derivative liabilities	(68)	(100)
Derivative Liabilities | Other Investments and Other Liabilities
Derivative [Line Items]
Gross Amounts of Recognized (Liabilities)	(92)	(115)
Gross Amounts Offset in the Statement of Financial Position, liabilities	(20)	(10)
Derivative liabilities	(68)	(100)
Accrued Interest and Cash Collateral (Received)	(4)	(5)
Financial Collateral (Received)	(65)	(96)
Net amount, liabilities	(7)	(9)
Derivative Assets | Other Investments and Other Liabilities
Derivative [Line Items]
Asset Derivatives [1]	31	25
Gross Amounts Offset in the Statement of Financial Position, assets	26	22
Derivative assets	7	10
Financial Collateral Pledged	2	1
Net Amount, assets	3	2
Accrued Interest and Cash Collateral (Received)	$ (2)	$ (7)

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