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CONSOLIDATED STATEMENT OF CASH FLOWS (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
CONSOLIDATED STATEMENT OF CASH FLOWS |  |  |
Fees paid for borrowings | $ 56 | $ 31 | $ 6

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