Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Representations and Warranties Obligations and Corporate Guarantees (Details)

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Commitments and Contingencies - Representations and Warranties Obligations and Corporate Guarantees (Details) - USD ($)
$ in Billions
Mar. 31, 2019
Dec. 31, 2018
Representations and Warranties Obligations and Corporate Guarantees    
Loss Contingencies [Line Items]    
Reserve for representations and warranties and corporate guarantees $ 1.9 $ 2.0