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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