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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, 2018 MXN ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($)
Operating activities: |  |  |  |
Profit before taxes | $ 100,993,902 | $ 5,131 | $ 57,096,844 | $ 23,477,595
Non-cash items | 187,192,818 |  | 195,680,543 | 228,623,927
Changes in working capital: | (39,856,192) |  | (35,005,012) | (16,303,468)
Net cash flows provided by operating activities | 248,330,528 | 12,617 | 217,772,375 | 235,798,054
Investing activities: |  |  |  |
Purchase of property, plant and equipment | (143,888,033) | (7,310) | (119,185,137) | (138,707,157)
Acquisition of intangibles | (7,933,647) | (403) | (17,538,541) | (16,316,738)
Dividends received from associates | 2,622,237 |  | 2,385,559 | 5,740,092
Proceeds from sale of plant, property and equipment | 178,532 | 9 | 133,349 | 115,600
Acquisition of business, net of cash acquired | (310,604) | (16) | (6,878,793) | (1,823,813)
Partial sale of shares of associate company | 548,484 | 28 | 340,040 |
Investment in associates companies |  |  |  | (3,487)
Net cash flows provided by (used in) investing activities | (148,783,031) | (7,559) | (140,743,523) | (150,995,503)
Financing activities: |  |  |  |
Bank loans, net | (34,050,923) |  | (27,433,489) | (61,390,813)
Acquisition of no controlling interest | (115,821) | (6) | (11,930) | (2,280,278)
Interest paid | (30,869,017) | (1,568) | (31,196,441) | (32,125,872)
Sale of shares of subsidiaries |  |  |  | 6,323,336
Repurchase of shares and others | (511,421) | (26) | (1,233,371) | (7,021,247)
Payment of dividends | (22,369,793) | (1,137) | (16,091,390) | (13,809,957)
Derivative financial instruments |  |  | (71,474) | (351,213)
Redemption of hybrid bond | (13,440,120) | (683) |  |
Net cash flows used in financing activities | (101,357,095) | (5,150) | (76,038,095) | (110,656,044)
Net (decrease) increase in cash and cash equivalents | (1,809,598) | (92) | 990,757 | (25,853,493)
Adjustment to cash flow for exchange rate differences | (800,913) | (41) | 61,333 | 3,911,844
Cash and cash equivalents at beginning of the period | 24,270,473 | 1,233 | 23,218,383 | 45,160,032
Cash and cash equivalents at end of the period | 21,659,962 | $ 1,100 | 24,270,473 | 23,218,383
Parent [member] |  |  |  |
Operating activities: |  |  |  |
Profit before taxes | 70,478,437 |  | 43,527,320 | 937,247
Non-cash items | (23,099,316) |  | (17,017,287) | (997,587)
Changes in working capital: | (49,040,542) |  | (18,973,478) | 74,520,320
Net cash flows provided by operating activities | (1,661,421) |  | 7,536,555 | 74,459,980
Investing activities: |  |  |  |
Purchase of property, plant and equipment | (17,709) |  | 16,526 |
Dividends received from associates | 24,314,803 |  | 21,465,687 | 21,950
Proceeds from sale of plant, property and equipment |  |  |  | 20,078
Partial sale of shares of associate company |  |  |  | 756,444
Net cash flows provided by (used in) investing activities | 24,297,094 |  | 21,482,213 | 798,472
Financing activities: |  |  |  |
Bank loans, net | 24,784,341 |  | 13,548,138 | (39,598,698)
Interest paid | (24,802,363) |  | (24,009,216) | (24,826,139)
Repurchase of shares and others | (514,007) |  | (1,240,028) | (7,092,385)
Payment of dividends | (20,787,102) |  | (14,406,748) | (13,437,168)
Net cash flows used in financing activities | (21,319,131) |  | (26,107,854) | (84,954,390)
Net (decrease) increase in cash and cash equivalents | 1,316,542 |  | 2,910,914 | (9,695,938)
Cash and cash equivalents at beginning of the period | 7,018,559 |  | 4,107,645 | 13,803,584
Cash and cash equivalents at end of the period | 8,335,101 |  | 7,018,559 | 4,107,645
Wholly-owned guarantor subsidiary [member] |  |  |  |
Operating activities: |  |  |  |
Profit before taxes | (1,698,687) |  | (12,182,970) | (5,537,427)
Non-cash items | 20,952,414 |  | 30,000,109 | 19,800,396
Changes in working capital: | (35,329,228) |  | (9,486) | 9,130,768
Net cash flows provided by operating activities | (16,075,501) |  | 17,807,653 | 23,393,737
Investing activities: |  |  |  |
Purchase of property, plant and equipment | (4,031,228) |  | (5,571,410) | (7,860,232)
Acquisition of intangibles | (2,993,373) |  | (3,053,345) | (4,947,506)
Dividends received from associates |  |  | 970,000 |
Acquisition of business, net of cash acquired |  |  | (3,381,505) | (2,796,254)
Investment in associates companies | (5,092,881) |  | 1,925,898 | 663,203
Net cash flows provided by (used in) investing activities | (12,117,482) |  | (9,110,362) | (14,940,789)
Financing activities: |  |  |  |
Interest paid | 26,385,526 |  | (7,092,098) | (7,972,827)
Net cash flows used in financing activities | 26,385,526 |  | (7,092,098) | (7,972,827)
Net (decrease) increase in cash and cash equivalents | (1,807,457) |  | 1,605,193 | 480,121
Cash and cash equivalents at beginning of the period | 3,553,352 |  | 1,948,159 | 1,468,036
Cash and cash equivalents at end of the period | 1,745,895 |  | 3,553,352 | 1,948,159
Combined non-guarantor subsidiaries [member] |  |  |  |
Operating activities: |  |  |  |
Profit before taxes | 78,176,117 |  | 35,230,373 | 28,077,775
Non-cash items | 149,503,016 |  | 171,062,158 | 209,821,118
Changes in working capital: | (61,332,380) |  | (66,062,629) | (93,359,195)
Net cash flows provided by operating activities | 166,346,753 |  | 140,229,902 | 144,539,698
Investing activities: |  |  |  |
Purchase of property, plant and equipment | (139,839,096) |  | (113,630,253) | (130,846,925)
Acquisition of intangibles | (4,940,274) |  | (14,485,196) | (11,369,232)
Dividends received from associates | 2,622,237 |  | 2,385,559 | 5,988,938
Proceeds from sale of plant, property and equipment | 178,532 |  | 133,349 | 95,522
Acquisition of business, net of cash acquired | (310,604) |  | (3,497,288) | (1,823,813)
Partial sale of shares of associate company | 548,484 |  | 340,040 | 2,796,254
Investment in associates companies |  |  |  | (666,690)
Net cash flows provided by (used in) investing activities | (141,740,721) |  | (128,753,789) | (135,825,946)
Financing activities: |  |  |  |
Bank loans, net | 19,592,788 |  | 16,382,838 | (21,792,115)
Acquisition of no controlling interest | (115,821) |  | (11,930) | (2,280,278)
Interest paid | (6,066,654) |  | (7,187,225) | (5,922,267)
Paid-In capital |  |  |  | (756,444)
Sale of shares of subsidiaries |  |  |  | 6,323,336
Repurchase of shares and others | 2,586 |  | 6,657 | 71,138
Payment of dividends | (25,897,494) |  | (24,120,329) | (643,585)
Derivative financial instruments |  |  | (71,474) | (351,213)
Redemption of hybrid bond | (13,440,120) |  |  |
Net cash flows used in financing activities | (25,924,715) |  | (15,001,463) | (25,351,428)
Net (decrease) increase in cash and cash equivalents | (1,318,683) |  | (3,525,350) | (16,637,676)
Adjustment to cash flow for exchange rate differences | (800,913) |  | 61,333 | 3,911,844
Cash and cash equivalents at beginning of the period | 13,698,562 |  | 17,162,579 | 29,888,412
Cash and cash equivalents at end of the period | 11,578,966 |  | 13,698,562 | 17,162,579
Eliminations [member] |  |  |  |
Operating activities: |  |  |  |
Profit before taxes | (45,961,965) |  | (9,477,879) |
Non-cash items | 39,836,704 |  | 11,635,563 |
Changes in working capital: | 105,845,958 |  | 50,040,581 | (6,595,361)
Net cash flows provided by operating activities | 99,720,697 |  | 52,198,265 | (6,595,361)
Investing activities: |  |  |  |
Dividends received from associates | (24,314,803) |  | (22,435,687) | (270,796)
Acquisition of business, net of cash acquired |  |  |  | 2,796,254
Partial sale of shares of associate company |  |  |  | (3,552,698)
Investment in associates companies | 5,092,881 |  | (1,925,898) |
Net cash flows provided by (used in) investing activities | (19,221,922) |  | (24,361,585) | (1,027,240)
Financing activities: |  |  |  |
Bank loans, net | (78,428,052) |  | (57,364,465) |
Interest paid | (26,385,526) |  | 7,092,098 | 6,595,361
Paid-In capital |  |  |  | 756,444
Payment of dividends | 24,314,803 |  | 22,435,687 | 270,796
Net cash flows used in financing activities | $ (80,498,775) |  | $ (27,836,680) | $ 7,622,601

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