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Basis of Preparation and Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Jan. 01, 2019 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Application of new accounting standards |  |  |  |
Right-of-use assets |  | $ 702 |  |
Current tax liabilities |  | 1,141 | $ 1,273 | $ 1,164
Trade and other payables |  | 12,637 | 10,913 | 12,841
Retained earnings |  | 3,265 | 5,879 | 5,683
Net decrease in cash and cash equivalents in the period |  | 643 | (379) |
Net cash (outflow)/inflows from financing activities |  | 941 | (481) |
Net cash inflow/(outflow) from operating activities |  | 491 | (75) |
Going concern |  |  |  |
Financial resources |  | 9,500 |  |
Cash balances |  | 5,400 |  |
Undrawn committed bank facilities |  | 4,100 |  |
Interest-bearing loans and borrowings |  | $ 1,629 | $ 4,215 | $ 1,754
Par value per ordinary share |  | $ 0.25 | $ 0.25 |
Proceeds from issue of share capital |  | $ 3,495 | $ 16 |
Years 3 and 4 |  |  |  |
Going concern |  |  |  |
Undrawn committed bank facilities |  | 3,400 |  |
Years 2 and 3 |  |  |  |
Going concern |  |  |  |
Undrawn committed bank facilities |  | 500 |  |
Years 1 and 2 |  |  |  |
Going concern |  |  |  |
Undrawn committed bank facilities |  | 200 |  |
Due within one year |  |  |  |
Going concern |  |  |  |
Undrawn committed bank facilities |  | $ 1,800 |  |
IFRS 16 |  |  |  |
Application of new accounting standards |  |  |  |
Right-of-use assets | $ 722 |  |  |
Lease liabilities | $ 720 |  |  |
Interest rate on lease liabilities | 3.00% |  |  |
Retained earnings | $ 0 |  |  |
Net decrease in cash and cash equivalents in the period | 0 |  |  |
Net cash (outflow)/inflows from financing activities | (84) |  |  |
Net cash inflow/(outflow) from operating activities | 84 |  |  |
IFRIC 23 |  |  |  |
Application of new accounting standards |  |  |  |
Current tax liabilities | (51) |  |  |
Trade and other payables | (3) |  |  |
Retained earnings | $ 54 |  |  |

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