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Derivatives - Fair Value Hedges (Details) - Fair value hedges $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
Derivatives in Fair Value Hedging Relationships |
Gain (Loss) on Derivative Recognized in Income | $ (12)
Gain (Loss) on Hedged Item Recognized in Income | 12
Interest rate swap contracts | Interest expense. |
Derivatives in Fair Value Hedging Relationships |
Gain (Loss) on Derivative Recognized in Income | (12)
Gain (Loss) on Hedged Item Recognized in Income | $ 12

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