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Supplemental Guarantor Information - Consolidated Statement of Cash Flows (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | [1] | Dec. 31, 2020 MXN ($) | Dec. 31, 2019 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($)
Cash flows from operating activities: |  |  |  |  |  |  |  |
Income before income taxes for continuing op. | $ 794 | $ 15,796 |  | $ 18,278 | [2] |  | $ 16,964 |
Non-cash items |  | 19,688 |  | 15,898 |  |  | 18,755 |
Changes in working capital |  | (337) |  | (2,887) |  |  | (8,138) |
Net cash flows generated from operating activities from continuing operations | 1,767 | 35,147 |  | 31,289 | [2] |  | 27,581 |
Income before income taxes from discontinued operations | 0 | 0 |  | 0 | [2] |  | 1,308 |
Operating activities from discontinued operations | 0 | 0 |  | 0 | [2] |  | 654 |
Investing activities: |  |  |  |  |  |  |  |
Acquisition and mergers, net of cash acquired |  |  |  |  |  |  | 1,957 |
Interest received | 53 | 1,047 |  | 1,230 | [2] |  | 1,004 |
Acquisition of long-lived assets, net |  | (9,381) |  | (9,994) |  |  | (9,518) |
Acquisition of intangible assets and other investing activities |  | (614) |  | (1,409) |  |  | (1,355) |
Investments in financial assets, net | (79) | (1,576) |  | (572) | [2] |  | (387) |
Dividends received | 1 | 16 |  | 1 | [2] |  | 8 |
Net cash flows (used in) investing activities from continuing operations | (527) | (10,508) |  | (10,744) | [2] |  | (8,291) |
Net cash flows (used in)/from investing activities from discontinued operations | 0 | 0 |  | 0 | [2] |  | (962) |
Financing activities: |  |  |  |  |  |  |  |
Proceeds from borrowings | 3,132 | 62,297 |  | 10,736 | [2] |  | 15,426 |
Repayments of borrowings | (2,272) | (45,187) |  | (20,460) | [2] |  | (15,957) |
Interest paid | (307) | (6,102) |  | (4,682) | [2] |  | (4,984) |
Dividends paid | (517) | (10,278) |  | (7,440) | [2] |  | (7,038) |
Interest paid on lease liabilities | (5) | (105) |  | (129) | [2] |  | 0 |
Payments of leases | (29) | (573) |  | (492) | [2] |  | 0 |
Other financing activities |  |  |  |  |  | $ 0 |  |
Proceeds from issuing shares | 18 | 365 |  | (327) | [2] |  | (1,682) |
Net cash flows (used in) financing activities from continuing operations | 20 | 417 |  | (22,794) | [2] |  | (14,235) |
Net cash flows (used in)/from financing activities from discontinued operations | 0 | 0 |  | 0 | [2] |  | (37) |
Net increase (decrease) in cash and cash equivalents from continuing operations | 1,260 | 25,056 |  | (2,249) | [2] |  | 5,055 |
Net increase (decrease) in cash and cash equivalents from discontinued operations | 0 | 0 |  | 0 | [2] |  | 963 |
Cash and cash equivalents at the beginning of the period | 1,030 | 20,491 | [2] | 23,727 | [2] |  | 18,767 |
Effects of exchange rate changes and inflation effects on the balance sheet of cash held in foreign currencies | (103) | (2,050) |  | (987) | [2] |  | (1,058) |
Cash and cash equivalents at the end of the period | $ 2,187 | 43,497 |  | 20,491 | [2] |  | 23,727 | [2]
Parent |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |
Income before income taxes for continuing op. |  | 10,731 |  | 10,995 |  |  | 13,180 |
Non-cash items |  | (11,264) |  | (13,994) |  |  | (15,622) |
Changes in working capital |  | 196 |  | (222) |  |  | (89) |
Net cash flows generated from operating activities from continuing operations |  | (337) |  | (3,221) |  |  | (2,531) |
Income before income taxes from discontinued operations |  |  |  |  |  |  | 0 |
Operating activities from discontinued operations |  |  |  |  |  |  | 0 |
Investing activities: |  |  |  |  |  |  |  |
Acquisition and mergers, net of cash acquired |  |  |  |  |  |  | 0 |
Interest received |  | 3,593 |  | 2,957 |  |  | 2,994 |
Acquisition of long-lived assets, net |  | 0 |  | 0 |  |  | 0 |
Acquisition of intangible assets and other investing activities |  | 762 |  | (3,693) |  |  | (10,153) |
Investments in financial assets, net |  | (3) |  | (86) |  |  | (9,576) |
Dividends received |  | 25,567 |  | 15,052 |  |  | 4,816 |
Net cash flows (used in) investing activities from continuing operations |  | 29,919 |  | 14,230 |  |  | (11,919) |
Net cash flows (used in)/from investing activities from discontinued operations |  |  |  |  |  |  | 0 |
Financing activities: |  |  |  |  |  |  |  |
Proceeds from borrowings |  | 59,129 |  | 9,400 |  |  | 10,100 |
Repayments of borrowings |  | (42,051) |  | (14,137) |  |  | (9,028) |
Interest paid |  | (7,019) |  | (4,006) |  |  | (4,189) |
Dividends paid |  | (10,210) |  | (7,437) |  |  | (7,038) |
Interest paid on lease liabilities |  | 0 |  | 0 |  |  |  |
Payments of leases |  | 0 |  | 0 |  |  |  |
Other financing activities |  |  |  |  |  | 0 |  |
Proceeds from issuing shares |  | (8,811) |  | (1,016) |  |  | 34,314 |
Net cash flows (used in) financing activities from continuing operations |  | (8,962) |  | (17,196) |  |  | 24,159 |
Net cash flows (used in)/from financing activities from discontinued operations |  |  |  |  |  |  | 0 |
Net increase (decrease) in cash and cash equivalents from continuing operations |  | 20,620 |  | (6,187) |  |  | 9,709 |
Net increase (decrease) in cash and cash equivalents from discontinued operations |  |  |  |  |  |  | 0 |
Cash and cash equivalents at the beginning of the period |  | 9,849 |  | 16,529 |  |  | 7,017 |
Effects of exchange rate changes and inflation effects on the balance sheet of cash held in foreign currencies |  | (473) |  | (493) |  |  | (197) |
Cash and cash equivalents at the end of the period |  | 29,996 |  | 9,849 |  |  | 16,529 |
Combined Wholly-owned Guarantors Subsidiaries |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |
Income before income taxes for continuing op. |  | 21,590 |  | 20,226 |  |  | 19,914 |
Non-cash items |  | (2,190) |  | (9,829) |  |  | (7,476) |
Changes in working capital |  | (2,626) |  | (4,975) |  |  | (10,958) |
Net cash flows generated from operating activities from continuing operations |  | 16,774 |  | 5,422 |  |  | 1,480 |
Income before income taxes from discontinued operations |  |  |  |  |  |  | 0 |
Operating activities from discontinued operations |  |  |  |  |  |  | 0 |
Investing activities: |  |  |  |  |  |  |  |
Acquisition and mergers, net of cash acquired |  |  |  |  |  |  | 0 |
Interest received |  | 1,876 |  | 2,460 |  |  | 2,187 |
Acquisition of long-lived assets, net |  | (3,667) |  | (4,218) |  |  | (3,506) |
Acquisition of intangible assets and other investing activities |  | (180) |  | 189 |  |  | 6,710 |
Investments in financial assets, net |  | (1,549) |  | (224) |  |  | (1,948) |
Dividends received |  | 13,830 |  | 868 |  |  | 0 |
Net cash flows (used in) investing activities from continuing operations |  | 10,310 |  | (925) |  |  | 3,443 |
Net cash flows (used in)/from investing activities from discontinued operations |  |  |  |  |  |  | 0 |
Financing activities: |  |  |  |  |  |  |  |
Proceeds from borrowings |  | 0 |  | 0 |  |  | 0 |
Repayments of borrowings |  | 0 |  | 0 |  |  | 0 |
Interest paid |  | (4,909) |  | (31) |  |  | (5,487) |
Dividends paid |  | (17,905) |  | (12,261) |  |  | (4,434) |
Interest paid on lease liabilities |  | (104) |  | (129) |  |  |  |
Payments of leases |  | (132) |  | (105) |  |  |  |
Other financing activities |  |  |  |  |  | 0 |  |
Proceeds from issuing shares |  | (4,159) |  | 11,484 |  |  | 5,118 |
Net cash flows (used in) financing activities from continuing operations |  | (27,209) |  | (1,042) |  |  | (4,803) |
Net cash flows (used in)/from financing activities from discontinued operations |  |  |  |  |  |  | 0 |
Net increase (decrease) in cash and cash equivalents from continuing operations |  | (125) |  | 3,455 |  |  | 120 |
Net increase (decrease) in cash and cash equivalents from discontinued operations |  |  |  |  |  |  | 0 |
Cash and cash equivalents at the beginning of the period |  | 4,464 |  | 1,026 |  |  | 926 |
Effects of exchange rate changes and inflation effects on the balance sheet of cash held in foreign currencies |  | (190) |  | (17) |  |  | (20) |
Cash and cash equivalents at the end of the period |  | 4,149 |  | 4,464 |  |  | 1,026 |
Combined non-guarantor Subsidiaries |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |
Income before income taxes for continuing op. |  | 10,918 |  | 14,502 |  |  | 16,766 |
Non-cash items |  | 5,699 |  | 12,276 |  |  | 8,957 |
Changes in working capital |  | 1,917 |  | 2,310 |  |  | 2,909 |
Net cash flows generated from operating activities from continuing operations |  | 18,534 |  | 29,088 |  |  | 28,632 |
Income before income taxes from discontinued operations |  |  |  |  |  |  | 1,308 |
Operating activities from discontinued operations |  |  |  |  |  |  | 654 |
Investing activities: |  |  |  |  |  |  |  |
Acquisition and mergers, net of cash acquired |  |  |  |  |  |  | 1,957 |
Interest received |  | 2,823 |  | 5,446 |  |  | 4,513 |
Acquisition of long-lived assets, net |  | (5,714) |  | (5,776) |  |  | (6,012) |
Acquisition of intangible assets and other investing activities |  | (1,196) |  | 2,095 |  |  | 2,088 |
Investments in financial assets, net |  | 8,623 |  | (3,705) |  |  | (23,820) |
Dividends received |  | 16 |  | 1 |  |  | 8 |
Net cash flows (used in) investing activities from continuing operations |  | 4,552 |  | (1,939) |  |  | (21,266) |
Net cash flows (used in)/from investing activities from discontinued operations |  |  |  |  |  |  | (962) |
Financing activities: |  |  |  |  |  |  |  |
Proceeds from borrowings |  | 3,168 |  | 1,336 |  |  | 5,326 |
Repayments of borrowings |  | (3,136) |  | (6,323) |  |  | (6,929) |
Interest paid |  | (1,419) |  | (10,278) |  |  | (3,998) |
Dividends paid |  | (21,560) |  | (3,662) |  |  | (382) |
Interest paid on lease liabilities |  | (1) |  | (125) |  |  |  |
Payments of leases |  | (265) |  | (473) |  |  |  |
Other financing activities |  |  |  |  |  | 0 |  |
Proceeds from issuing shares |  | 4,688 |  | (7,141) |  |  | (6,157) |
Net cash flows (used in) financing activities from continuing operations |  | (18,525) |  | (26,666) |  |  | (12,140) |
Net cash flows (used in)/from financing activities from discontinued operations |  |  |  |  |  |  | (37) |
Net increase (decrease) in cash and cash equivalents from continuing operations |  | 4,561 |  | 483 |  |  | (4,774) |
Net increase (decrease) in cash and cash equivalents from discontinued operations |  |  |  |  |  |  | 963 |
Cash and cash equivalents at the beginning of the period |  | 6,178 |  | 6,172 |  |  | 10,824 |
Effects of exchange rate changes and inflation effects on the balance sheet of cash held in foreign currencies |  | (1,387) |  | (477) |  |  | (841) |
Cash and cash equivalents at the end of the period |  | 9,352 |  | 6,178 |  |  | 6,172 |
Eliminations |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |
Income before income taxes for continuing op. |  | (27,443) |  | (27,445) |  |  | (32,896) |
Non-cash items |  | 27,443 |  | 27,445 |  |  | 32,896 |
Changes in working capital |  | 176 |  | 0 |  |  | 0 |
Net cash flows generated from operating activities from continuing operations |  | 176 |  | 0 |  |  | 0 |
Income before income taxes from discontinued operations |  |  |  |  |  |  | 0 |
Operating activities from discontinued operations |  |  |  |  |  |  | 0 |
Investing activities: |  |  |  |  |  |  |  |
Acquisition and mergers, net of cash acquired |  |  |  |  |  |  | 0 |
Interest received |  | (7,245) |  | (9,633) |  |  | (8,690) |
Acquisition of long-lived assets, net |  | 0 |  | 0 |  |  | 0 |
Acquisition of intangible assets and other investing activities |  | 0 |  | 0 |  |  | 0 |
Investments in financial assets, net |  | (8,647) |  | 3,443 |  |  | 34,957 |
Dividends received |  | (39,397) |  | (15,920) |  |  | (4,816) |
Net cash flows (used in) investing activities from continuing operations |  | (55,289) |  | (22,110) |  |  | 21,451 |
Net cash flows (used in)/from investing activities from discontinued operations |  |  |  |  |  |  | 0 |
Financing activities: |  |  |  |  |  |  |  |
Proceeds from borrowings |  | 0 |  | 0 |  |  | 0 |
Repayments of borrowings |  | 0 |  | 0 |  |  | 0 |
Interest paid |  | 7,245 |  | 9,633 |  |  | 8,690 |
Dividends paid |  | 39,397 |  | 15,920 |  |  | 4,816 |
Interest paid on lease liabilities |  | 0 |  | 125 |  |  |  |
Payments of leases |  | (176) |  | 86 |  |  |  |
Other financing activities |  |  |  |  |  | $ 0 |  |
Proceeds from issuing shares |  | 8,647 |  | (3,654) |  |  | (34,957) |
Net cash flows (used in) financing activities from continuing operations |  | 55,113 |  | 22,110 |  |  | (21,451) |
Net cash flows (used in)/from financing activities from discontinued operations |  |  |  |  |  |  | 0 |
Net increase (decrease) in cash and cash equivalents from continuing operations |  | 0 |  | 0 |  |  | 0 |
Net increase (decrease) in cash and cash equivalents from discontinued operations |  |  |  |  |  |  | 0 |
Cash and cash equivalents at the beginning of the period |  | 0 |  | 0 |  |  | 0 |
Effects of exchange rate changes and inflation effects on the balance sheet of cash held in foreign currencies |  | 0 |  | 0 |  |  | 0 |
Cash and cash equivalents at the end of the period |  | $ 0 |  | $ 0 |  |  | $ 0 |
[1] | Convenience translation to U.S. dollars ($) – See Note 2.2.3
[2] | The Company initially adopted IFRS 16 at January 1, 2019 using the modified retrospective approach under which the comparative information is not restated. – See Note 3.18

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