Annual report pursuant to Section 13 and 15(d)

Equity - Equity-based Compensation Expense and Fair Value of Shares Vested (Details)

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Equity - Equity-based Compensation Expense and Fair Value of Shares Vested (Details) - 2013 Plan - Restricted Incentive - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity-based compensation expense $ 14 $ 10 $ 11
Fair value of awards vested on vesting date $ 19 $ 7 $ 5