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Supplemental Guarantor Information - Condensed Consolidating Statements of Cash Flows (Detail) $ in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2019 MXN ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($)
Operating activities: |  |  |  |
Profit before income tax | $ 121,346,988 | $ 6,439 | $ 100,993,902 | $ 57,096,844
Non-cash items | 188,187,022 |  | 187,192,818 | 195,680,543
Working capital changes | (75,255,542) |  | (39,856,192) | (35,005,012)
Net cash flows provided by operating activities | 234,278,468 | 12,431 | 248,330,528 | 217,772,375
Investing activities: |  |  |  |
Purchase of property, plant and equipment | (132,884,335) | (7,051) | (143,888,033) | (119,185,137)
Acquisition of intangibles | (18,962,856) | (1,006) | (7,933,647) | (17,538,541)
Dividends received | 1,773,336 |  | 2,622,237 | 2,385,559
Proceeds from sale of plant, property and equipment | 344,924 | 18 | 178,532 | 133,349
Acquisition of business, net of cash acquired | (13,330,651) | (707) | (310,604) | (6,878,793)
Investments in associate companies | (56,985) | (3) |  |
Partial sale of shares of associated company | 36,478 | 2 | 548,484 | 340,040
Net cash flows used in investing activities | (163,080,089) | (8,653) | (148,783,031) | (140,743,523)
Financing activities: |  |  |  |
Bank loans, net | 8,273,440 |  | (34,050,923) | (27,433,489)
Acquisition of non-controlling interests | (83,055) | (4) | (115,821) | (11,930)
Interest paid | (28,046,695) | (1,488) | (30,869,017) | (31,196,441)
Sale of shares of subsidiaries | 36,478 |  |  |
Repurchase of shares | (435,713) | (23) | (511,421) | (1,233,371)
Dividends paid | (24,248,145) | (1,287) | (22,369,793) | (16,091,390)
Payment of liability related to right-of-use of assets | (26,765,075) | (1,420) |  |
Derivative financial instruments |  |  |  | (71,474)
Redemption of hybrid bond | 0 | 0 | (13,440,120) |
Net cash flows used in financing activities | (71,305,243) | (3,783) | (101,357,095) | (76,038,095)
Net (decrease) increase in cash and cash equivalents | (106,864) | (5) | (1,809,598) | 990,757
Adjustment to cash flows due to exchange rate fluctuations, net | (1,807,442) | (96) | (800,913) | 61,333
Cash and cash equivalents at beginning of the year | 21,659,962 | 1,149 | 24,270,473 | 23,218,383
Cash and cash equivalents at end of the year | 19,745,656 | $ 1,048 | 21,659,962 | 24,270,473
Parent [member] |  |  |  |
Operating activities: |  |  |  |
Profit before income tax | 80,829,717 |  | 70,478,437 | 43,527,320
Non-cash items | (46,879,977) |  | (23,099,316) | (17,017,287)
Working capital changes | (24,351,260) |  | (49,040,542) | (18,973,478)
Net cash flows provided by operating activities | 9,598,480 |  | (1,661,421) | 7,536,555
Investing activities: |  |  |  |
Purchase of property, plant and equipment | (147,714) |  | (17,709) | 16,526
Dividends received | 27,817,109 |  | 24,314,803 | 21,465,687
Acquisition of business, net of cash acquired | (7,335,058) |  |  |
Investments in associate companies | (5,819,645) |  |  |
Net cash flows used in investing activities | 14,514,692 |  | 24,297,094 | 21,482,213
Financing activities: |  |  |  |
Bank loans, net | 14,815,606 |  | 24,784,341 | 13,548,138
Interest paid | (21,907,497) |  | (24,802,363) | (24,009,216)
Repurchase of shares | (435,713) |  | (514,007) | (1,240,028)
Dividends paid | (22,738,755) |  | (20,787,102) | (14,406,748)
Net cash flows used in financing activities | (30,266,359) |  | (21,319,131) | (26,107,854)
Net (decrease) increase in cash and cash equivalents | (6,153,187) |  | 1,316,542 | 2,910,914
Cash and cash equivalents at beginning of the year | 8,335,101 |  | 7,018,559 | 4,107,645
Cash and cash equivalents at end of the year | 2,181,914 |  | 8,335,101 | 7,018,559
Wholly-owned guarantor subsidiary [member] |  |  |  |
Operating activities: |  |  |  |
Profit before income tax | 2,197,117 |  | (1,698,687) | (12,182,970)
Non-cash items | 12,508,840 |  | 20,952,414 | 30,000,109
Working capital changes | (36,428,726) |  | (35,329,228) | (9,486)
Net cash flows provided by operating activities | (21,722,769) |  | (16,075,501) | 17,807,653
Investing activities: |  |  |  |
Purchase of property, plant and equipment | (1,821,745) |  | (4,031,228) | (5,571,410)
Acquisition of intangibles | (2,413,193) |  | (2,993,373) | (3,053,345)
Dividends received |  |  |  | 970,000
Acquisition of business, net of cash acquired |  |  |  | (3,381,505)
Investments in associate companies | (3,359,058) |  | (5,092,881) | 1,925,898
Net cash flows used in investing activities | (7,593,996) |  | (12,117,482) | (9,110,362)
Financing activities: |  |  |  |
Interest paid | 28,895,698 |  | 26,385,526 | (7,092,098)
Net cash flows used in financing activities | 28,895,698 |  | 26,385,526 | (7,092,098)
Net (decrease) increase in cash and cash equivalents | (421,067) |  | (1,807,457) | 1,605,193
Cash and cash equivalents at beginning of the year | 1,745,895 |  | 3,553,352 | 1,948,159
Cash and cash equivalents at end of the year | 1,324,828 |  | 1,745,895 | 3,553,352
Combined non-guarantor subsidiaries [member] |  |  |  |
Operating activities: |  |  |  |
Profit before income tax | 102,308,386 |  | 78,176,117 | 35,230,373
Non-cash items | 174,550,273 |  | 149,503,016 | 171,062,158
Working capital changes | (56,610,878) |  | (61,332,380) | (66,062,629)
Net cash flows provided by operating activities | 220,247,781 |  | 166,346,753 | 140,229,902
Investing activities: |  |  |  |
Purchase of property, plant and equipment | (130,914,876) |  | (139,839,096) | (113,630,253)
Acquisition of intangibles | (16,549,663) |  | (4,940,274) | (14,485,196)
Dividends received | 1,773,336 |  | 2,622,237 | 2,385,559
Proceeds from sale of plant, property and equipment | 344,924 |  | 178,532 | 133,349
Acquisition of business, net of cash acquired | (5,995,593) |  | (310,604) | (3,497,288)
Investments in associate companies | (56,985) |  |  |
Partial sale of shares of associated company |  |  | 548,484 | 340,040
Net cash flows used in investing activities | (151,362,379) |  | (141,740,721) | (128,753,789)
Financing activities: |  |  |  |
Bank loans, net | (104,185) |  | 19,592,788 | 16,382,838
Acquisition of non-controlling interests | (83,055) |  | (115,821) | (11,930)
Interest paid | (6,139,198) |  | (6,066,654) | (7,187,225)
Sale of shares of subsidiaries | 36,478 |  |  |
Repurchase of shares |  |  | 2,586 | 6,657
Dividends paid | (29,326,499) |  | (25,897,494) | (24,120,329)
Payment of liability related to right-of-use of assets | (26,765,075) |  |  |
Derivative financial instruments |  |  |  | (71,474)
Redemption of hybrid bond |  |  | (13,440,120) |
Net cash flows used in financing activities | (62,418,012) |  | (25,924,715) | (15,001,463)
Net (decrease) increase in cash and cash equivalents | 6,467,390 |  | (1,318,683) | (3,525,350)
Adjustment to cash flows due to exchange rate fluctuations, net | (1,807,442) |  | (800,913) | 61,333
Cash and cash equivalents at beginning of the year | 11,578,966 |  | 13,698,562 | 17,162,579
Cash and cash equivalents at end of the year | 16,238,914 |  | 11,578,966 | 13,698,562
Eliminations [member] |  |  |  |
Operating activities: |  |  |  |
Profit before income tax | (63,988,232) |  | (45,961,965) | (9,477,879)
Non-cash items | 48,007,886 |  | 39,836,704 | 11,635,563
Working capital changes | 42,135,322 |  | 105,845,958 | 50,040,581
Net cash flows provided by operating activities | 26,154,976 |  | 99,720,697 | 52,198,265
Investing activities: |  |  |  |
Dividends received | (27,817,109) |  | (24,314,803) | (22,435,687)
Investments in associate companies | 9,178,703 |  | 5,092,881 | (1,925,898)
Net cash flows used in investing activities | (18,638,406) |  | (19,221,922) | (24,361,585)
Financing activities: |  |  |  |
Bank loans, net | (6,437,981) |  | (78,428,052) | (57,364,465)
Interest paid | (28,895,698) |  | (26,385,526) | 7,092,098
Dividends paid | 27,817,109 |  | 24,314,803 | 22,435,687
Net cash flows used in financing activities | $ (7,516,570) |  | $ (80,498,775) | $ (27,836,680)

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