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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”.