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Net Deferred Tax Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Schedule of Deferred Income Tax Assets and Liabilities    
Lease right-of-use asset $ 3,427.3 $ 3,296.8
Property and equipment 1,600.4 1,316.4
Intangible assets 1,046.2 334.8
Other 322.4 511.1
Total deferred tax liabilities 6,396.3 5,459.1
Lease liability (3,462.0) (3,331.1)
Intangible assets (2,095.9) (1,051.0)
Property and equipment (593.8) (585.6)
Deferred foreign tax credits (289.3) (311.2)
Employee benefit plans (190.8) (192.3)
Deferred revenue (154.8) (145.5)
Operating loss carryforwards (86.8) (81.5)
Other (449.0) (323.6)
Total deferred tax assets before valuation allowance (7,322.4) (6,021.8)
Valuation allowance 816.0 741.9
Deferred Tax Liabilities, Net   179.2
Net deferred tax liabilities 110.1  
Balance sheet presentation: [Abstract]    
Deferred Income Taxes 2,025.6 1,318.1
Other assets-miscellaneous    
Balance sheet presentation: [Abstract]    
Deferred tax assets $ (2,135.7) $ (1,138.9)