32. Contractual undiscounted future cash flows for financial liabilities
| At 31 March 2022 | Less than one year US$m | One to two years US$m | Two to three years US$m | Three to four years US$m | Four to five years US$m | Over five years US$m | Total US$m |
| Borrowings | 146 | 141 | 647 | 625 | 642 | 2,609 | 4,810 |
| Net settled derivative financial instruments – interest rate swaps | 6 | 5 | — | (1) | (1) | (7) | 2 |
| Gross settled derivative financial instruments: | |||||||
| Outflows for derivative contracts | 861 | 19 | 411 | 12 | 506 | — | 1,809 |
| Inflows for derivative contracts | (839) | (15) | (409) | (7) | (506) | — | (1,776) |
| Gross settled derivative financial instruments | 22 | 4 | 2 | 5 | — | — | 33 |
| Options in respect of acquisitions and non-controlling interests | 2 | — | — | 8 | 168 | 18 | 196 |
| Trade and other payables | 604 | 74 | 4 | 1 | 8 | 3 | 694 |
| Cash outflows | 780 | 224 | 653 | 638 | 817 | 2,623 | 5,735 |
| At 31 March 2021 | Less than one year US$m | One to two years US$m | Two to three years US$m | Three to four years US$m | Four to five years US$m | Over five years US$m | Total US$m |
| Borrowings | 749 | 138 | 124 | 660 | 639 | 2,704 | 5,014 |
| Net settled derivative financial instruments – interest rate swaps | 28 | 26 | 19 | 11 | 8 | 6 | 98 |
| Gross settled derivative financial instruments: | |||||||
| Outflows for derivative contracts | 545 | — | — | — | — | — | 545 |
| Inflows for derivative contracts | (539) | — | — | — | — | — | (539) |
| Gross settled derivative financial instruments | 6 | — | — | — | — | — | 6 |
| Options in respect of non-controlling interests | 7 | — | — | — | 11 | 202 | 220 |
| Trade and other payables | 562 | 43 | — | — | — | 2 | 607 |
| Cash outflows | 1,352 | 207 | 143 | 671 | 658 | 2,914 | 5,945 |
The table above analyses financial liabilities into maturity groupings, based on the period from the balance sheet date to the contractual maturity date. As the amounts disclosed are the contractual undiscounted cash flows, they differ from the carrying values and fair values. Contractual undiscounted future cash outflows for derivative financial liabilities in total amount to US$35m (2021: US$104m).