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Changes in Equity and Earnings Per Share - Summary of Changes in Other Comprehensive Income Reserves (Detail) - USD ($) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Other comprehensive income |  |  |
Exchange differences on translation of foreign operations (gains/(losses)) |  | $ (13,025) | $ 1,714
Cash flow hedges |  | (99) | (168)
Re-measurements of post-employment benefits |  | (1) | (35)
Total comprehensive income |  | (15,239) | 8,154
Translation reserves [member] |  |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |  |
Beginning balance |  | (19,936) | (21,079)
Other comprehensive income |  |  |
Exchange differences on translation of foreign operations (gains/(losses)) |  | (12,293) | 1,719
Cash flow hedges and cumulative translation adjustments in relation to Australia divestiture reclassified to profit ot loss |  | (645) |
Re-measurements of post-employment benefits |  | 0 |
Total comprehensive income |  | (12,938) | 1,719
Ending balance |  | (32,874) | (19,360)
Hedging reserves [member] |  |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |  |
Beginning balance |  | 397 | 494
Other comprehensive income |  |  |
Exchange differences on translation of foreign operations (gains/(losses)) |  | 0 |
Cash flow hedges |  | (138) | (134)
Cash flow hedges and cumulative translation adjustments in relation to Australia divestiture reclassified to profit ot loss |  | 219 |
Re-measurements of post-employment benefits |  | 0 |
Total comprehensive income |  | 81 | (134)
Ending balance |  | 478 | 360
Post- employment benefits [member] |  |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |  |
Beginning balance |  | (1,740) | (1,567)
Other comprehensive income |  |  |
Exchange differences on translation of foreign operations (gains/(losses)) |  | 0 |
Cash flow hedges |  | 0 |
Re-measurements of post-employment benefits |  | (1) | (37)
Total comprehensive income |  | (1) | (37)
Ending balance |  | (1,741) | (1,604)
OCI reserves [member] |  |  |
Disclosure of information about changes in other comprehensive income reserves [line items] |  |  |
Beginning balance |  | (21,279) | (22,152)
Other comprehensive income |  |  |
Exchange differences on translation of foreign operations (gains/(losses)) | [1] | (12,293) | 1,719
Foreign exchange contracts recognized in equity in relation to the SAB combination |  |  | 1,719
Cash flow hedges | [1] | (138) | (134)
Cash flow hedges and cumulative translation adjustments in relation to Australia divestiture reclassified to profit ot loss |  | (426) |
Re-measurements of post-employment benefits | [1] | (1) | (37)
Total comprehensive income | [1] | (12,858) | 1,548
Ending balance |  | $ (34,137) | $ (20,604)
[1] | See Note 18 Changes in equity and earning per share.

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