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Fair Value Disclosure and Measurement on Recurring Basis (Detail)
¥ in Millions, $ in Millions
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Fair value disclosure      
Long-term notes payable ¥ 45,282 $ 6,504 ¥ 68,763
Convertible senior notes 14,142 2,031 4,923
Fair value measurements on a recurring basis      
Total assets measured at fair value 22,784 3,273 86,803
Total liabilities measured at fair value 526 76 464
Cash Equivalents      
Fair value disclosure      
Time deposits 10,848 1,558 4,264
Money market fund 1,719 247 3,723
Short-term Investments      
Fair value disclosure      
Held-to-maturity debt investments 107,654 15,464 27,507
Fair value measurements on a recurring basis      
Available-for-sale debt investments 5,637 810 79,558
Long-term investments      
Fair value disclosure      
Held-to-maturity debt investments 491 70  
Fair value measurements on a recurring basis      
Equity investments at fair value with readily determinable fair value 11,334 1,628 4,428
Investments accounted for at fair value 1,819 261 1,457
Available-for-sale debt investments 3,970 570 1,167
Other non-current assets      
Fair value measurements on a recurring basis      
Derivative instruments 24 4 193
Accounts Payable and Accrued Liabilities      
Fair value measurements on a recurring basis      
Derivative instruments 125 18 123
Amounts Due To Related Parties current      
Fair value measurements on a recurring basis      
Financial liabilities 401 $ 58 341
Fair Value, Inputs, Level 1      
Fair value measurements on a recurring basis      
Total assets measured at fair value 11,334   4,428
Fair Value, Inputs, Level 1 | Cash Equivalents      
Fair value disclosure      
Money market fund 1,719   3,723
Fair Value, Inputs, Level 1 | Long-term investments      
Fair value measurements on a recurring basis      
Equity investments at fair value with readily determinable fair value 11,334   4,428
Fair Value, Inputs, Level 2      
Fair value disclosure      
Long-term notes payable 45,282   68,763
Convertible senior notes 14,142   4,923
Fair value measurements on a recurring basis      
Total assets measured at fair value 5,661   79,745
Total liabilities measured at fair value 401   341
Fair Value, Inputs, Level 2 | Cash Equivalents      
Fair value disclosure      
Time deposits 10,848   4,264
Fair Value, Inputs, Level 2 | Short-term Investments      
Fair value disclosure      
Held-to-maturity debt investments 107,654   27,507
Fair value measurements on a recurring basis      
Available-for-sale debt investments 5,637   79,558
Fair Value, Inputs, Level 2 | Long-term investments      
Fair value disclosure      
Held-to-maturity debt investments 491    
Fair Value, Inputs, Level 2 | Other non-current assets      
Fair value measurements on a recurring basis      
Derivative instruments 24   187
Fair Value, Inputs, Level 2 | Amounts Due To Related Parties current      
Fair value measurements on a recurring basis      
Financial liabilities 401   341
Fair Value, Inputs, Level 3      
Fair value measurements on a recurring basis      
Total assets measured at fair value 5,789   2,630
Total liabilities measured at fair value 125   123
Fair Value, Inputs, Level 3 | Long-term investments      
Fair value measurements on a recurring basis      
Investments accounted for at fair value 1,819   1,457
Available-for-sale debt investments 3,970   1,167
Fair Value, Inputs, Level 3 | Other non-current assets      
Fair value measurements on a recurring basis      
Derivative instruments     6
Fair Value, Inputs, Level 3 | Accounts Payable and Accrued Liabilities      
Fair value measurements on a recurring basis      
Derivative instruments ¥ 125   ¥ 123