Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Narrative (Details)

v3.19.3.a.u2
Fair Value Measurements - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fair Value Disclosures [Abstract]    
Aggregate carrying value which approximates fair value $ 812 $ 515