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Changes in Accumulated Other Comprehensive (Loss) Income by Component, Net of Tax (Detail)
¥ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2018
CNY (¥)
Sep. 30, 2017
CNY (¥)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
CNY (¥)
Sep. 30, 2017
CNY (¥)
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balances         ¥ 119,350  
Cumulative effect of accounting change   ¥ 967     967  
Net current-period other comprehensive income $ 70 483 ¥ 872 $ 69 476 ¥ 1,661
Balances 25,166 172,844   25,166 172,844  
Foreign currency translation adjustment            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balances         (888) (2,022)
Cumulative effect of accounting change [1]   0     0  
Other comprehensive income before reclassification         79 974
Amounts reclassified from accumulated other comprehensive income         80 48
Net current-period other comprehensive income         159 1,022
Other comprehensive income (loss) attributable to noncontrolling interests and redeemable noncontrolling interests         (992) 192
Balances (251) (1,721) (808) (251) (1,721) (808)
Unrealized gains on available- for-sale investments            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balances         1,818 239
Cumulative effect of accounting change [1]   (1,854)     (1,854)  
Other comprehensive income before reclassification         3,529 1,406
Amounts reclassified from accumulated other comprehensive income         (1,358) (767)
Net current-period other comprehensive income         317 639
Other comprehensive income (loss) attributable to noncontrolling interests and redeemable noncontrolling interests         (15) 0
Balances 309 2,120 878 309 2,120 878
Accumulated Other Comprehensive Income            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Balances         930 (1,783)
Cumulative effect of accounting change [1]   (1,854)     (1,854)  
Other comprehensive income before reclassification         3,608 2,380
Amounts reclassified from accumulated other comprehensive income         (1,278) (719)
Net current-period other comprehensive income         476 1,661
Other comprehensive income (loss) attributable to noncontrolling interests and redeemable noncontrolling interests         (1,007) 192
Balances $ 58 ¥ 399 ¥ 70 $ 58 ¥ 399 ¥ 70
[1] Adjustment of net unrealized gains related to available-for-sale equity investments from accumulated other comprehensive income to opening retained earnings as a result of the adoption of ASC 321 on January 1, 2018.