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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Available-for-sale securities:
Tax impact on net unrealized gains (losses)	$ 0	$ 1	$ 0	$ 3
Tax impact of reclassifications to net income	0	(8)	0	(8)
Cash flow hedges:
Tax impact on net unrealized gains	1	(2)	1	(9)
Tax impact of reclassifications to net income	$ 0	$ 0	$ 0	$ (1)

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Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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