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Fair Value Measurements - Debt Financing (Details) - USD ($)
$ in Billions
Dec. 31, 2019
Dec. 31, 2018
Book Value    
Financial Instruments Not Measured at Fair Value    
Debt financing $ 13.7 $ 11.7
Level 2    
Financial Instruments Not Measured at Fair Value    
Debt financing $ 14.1 $ 11.4