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Summary of Significant Accounting Policies Lease Accounting (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Lease right-of-use asset, net $ 13,261.2 $ 12,500.0 $ 0.0
Operating Lease, Liability $ 13,378.8 $ 12,500.0