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Basis of Presentation Additional Information (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Basis Of Presentation [Line Items]      
Revenue recognition for estimated returns, description Return rates are estimated by using a historical weighted average return rate over a four-year period    
Accounting Standards Update 2018-02 | Retained Earnings | Scenario, Forecast      
Basis Of Presentation [Line Items]      
Increase (decrease) in Retained Earnings due to adoption of accounting standard     $ 30
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income (Loss) | Scenario, Forecast      
Basis Of Presentation [Line Items]      
Increase (decrease) in AOCI due to adoption of accounting standard     $ (30)
Accounting Standards Update 2016-02      
Basis Of Presentation [Line Items]      
Cash receipts from direct financing leases $ 816    
Accounting Standards Update 2016-02 | Retained Earnings | Scenario, Forecast      
Basis Of Presentation [Line Items]      
Increase (decrease) in retained earnings due to adoption of accounting standard   $ (11)