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Schedule of Investments at Amortized Cost and Fair Value (Detail) ¥ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CNY (¥)
Trading Securities |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Other invested securities, cost or amortized cost |  | ¥ 7,686 |  | ¥ 18,289
Other invested securities, gross unrealized gains | ¥ 169 | 62 |  |
Other invested securities, gross unrealized loss | ¥ (108) |  |  |
Other invested securities, fair value |  | 7,748 | $ 2,820 | 18,350
Other Long-term Investments |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Investments accounted for at fair value, cost or amortized cost |  |  |  | 307
Investment accounted for at fair value option, gross unrealized gains |  |  |  | 14
Investments accounted for at fair value, fair value |  |  | 49 | 321
Other Long-term Investments | Equity Investments |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Available-for-sale investments, cost or amortized cost |  | 528 |  | 2,077
Available-for-sale investments, gross unrealized gains |  |  |  | 742
Available-for-sale investments, gross unrealized losses |  | (31) |  | (46)
Available-for-sale investments noncurrent, fair value |  | 497 | 426 | 2,773
Short-term Investments | Equity Investments |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Available-for-sale investments, cost or amortized cost |  | 33 |  |
Available-for-sale investments, gross unrealized losses |  | (4) |  |
Available-for-sale investments current, fair value |  | 29 |  |
Short-term Investments | Fixed-rate Investments |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Short-term held-to-maturity investments, cost or amortized cost |  | 41,802 |  | 48,666
Held-to-maturity investments, gross unrecognized holding gains |  | 70 |  | 47
Held-to-maturity investments, gross unrecognized holding losses |  | (4) |  | (18)
Held-to-maturity investments, fair value |  | 41,868 | 7,484 | 48,695
Available-for-sale investments, cost or amortized cost |  | 14,353 |  | 29,550
Available-for-sale investments, gross unrealized gains |  | 31 |  | 477
Available-for-sale investments, gross unrealized losses |  | (6) |  | (5)
Available-for-sale investments current, fair value |  | 14,378 | 4,614 | 30,022
Short-term Investments | Adjustable-rate Debt Investments |  |  |  |
Amortized cost, Gain (loss) and Fair value on Investments [Line Items] |  |  |  |
Available-for-sale investments, cost or amortized cost |  | 14,674 |  | 10,589
Available-for-sale investments, gross unrealized gains |  | 313 |  | 104
Available-for-sale investments current, fair value |  | ¥ 14,987 | $ 1,643 | ¥ 10,693

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 + Details
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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 + Details
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- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=63488139&loc=d3e12121-115841 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column C.3,4) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column E.2,3) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column C.7) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.Column C.6) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010 + Details
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