v3.20.1
Fair Value Measurement - Nonrecurring (Details) - Fair Value Measurements Nonrecurring [Member]
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Fair Value, Disclosure Item Amounts [Domain]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Before-Tax Loss - Cost and Equity method investments $ 510
Fair Value - Equity Method Investment 77
Fair Value, Inputs, Level 3 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair Value - Equity Method Investment $ 77