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International Theme Parks Impact of Consolidating Income Statements of International Theme Parks (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Jul. 01, 2017
Apr. 01, 2017
Dec. 31, 2016
Oct. 01, 2016
Jul. 02, 2016
Apr. 02, 2016
Jan. 02, 2016
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Schedule of Condensed Consolidating Statement of Operations [Line Items]                      
Revenues $ 12,779 $ 14,238 $ 13,336 $ 14,784 $ 13,142 $ 14,277 $ 12,969 $ 15,244 $ 55,137 $ 55,632 $ 52,465
Cost and expenses                 (41,264) (41,274) (39,241)
Equity in the loss of investees                 320 $ 926 $ 814
International Theme Parks                      
Schedule of Condensed Consolidating Statement of Operations [Line Items]                      
Revenues                 3,318    
Cost and expenses                 (3,265)    
Equity in the loss of investees                 $ (25)