v3.19.3.a.u2
Income Taxes - Reconciliation of Income Tax Expense with Expected Federal Income Tax Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Statutory income tax expense, amount $ 1,205 $ 1,130 $ 1,834
State and local taxes (net of federal benefit), amount 96 99 60
Impact of federal, foreign, state, and local tax rate changes on deferred taxes, amount 5 0 (1,637)
Mandatory deemed repatriation tax, rate   0 477
Stock-based compensation awards, amount (23) (64) (159)
Effect of foreign tax rates, amount (76) (119) (337)
Other, amount 54 30 32
Total income tax expense $ 1,261 $ 1,076 $ 270
Statutory income tax expense, rate 21.00% 21.00% 35.00%
State and local taxes (net of federal benefit), rate 2.00% 2.00% 1.00%
Impact of federal, foreign, state, and local tax rate changes on deferred taxes, rate     (31.00%)
Mandatory deemed repatriation tax, rate     9.00%
Stock-based compensation awards, rate   (1.00%) (3.00%)
Effect of foreign tax rates, rate (1.00%) (2.00%) (6.00%)
Other, rate 0.00% 0.00% 0.00%
Effective income tax rate 22.00% 20.00% 5.00%