Fair Value - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in equity securities	$ 124	$ 141
Available-for-sale debt securities	107	101
Trading securities	12	12
Total assets	243	254
Fair value of interest rate swap agreement	1	2
Total liabilities	1	2
Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments in equity securities	124	141
Total assets	124	141
Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	107	101
Trading securities	12	12
Total assets	119	113
Fair value of interest rate swap agreement	1	2
Total liabilities	$ 1	$ 2