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Group cash flow statement (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Buy-back of bonds |  |  | $ 1,900 | $ 2,500
Net Interest Paid Associated With Bond Redepemption |  |  | 80 | 259
Net interest paid associated with bond redemption | [1] | $ 537 | 612 | 897
Purchases of financial assets | [2] | 43 | 1,572 | 723
Adjustments for derivative contracts transacted and not designated for hedge relationship |  |  | 288 | (501)
Adjustments to add back gain on sale of surplus land at Kitmat |  |  | 549 |
Revaluation of a financial asset |  | 0 | 0 | (8)
Fixed Income Instruments [Member] |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Purchases of financial assets |  | $ 28 | $ 1,600 | $ 700
[1] | In 2018 and 2017 we completed bond buy-back programmes of US$1.9 billion (nominal value) and US$2.5 billion (nominal value) respectively. Net interest paid included the payment of the premiums and the accelerated interest associated with the bond redemptions (2018: US$80 million, 2017: US$259 million). There was no bond buy-back programme in 2019.
[2] | In 2019, we invested a further US$28 million in a separately managed portfolio of fixed income instruments (refer to note 20) (2018: US$1.6 billion, 2017: US$0.7 billion). As there is significant turnover in this portfolio, we have elected to report the purchases and sales of these securities on a net cash flow basis within “Purchases of financial assets”.

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