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] | |
| Assets, Fair Value Disclosure | $ 77 |
| Before-Tax Loss - Cost and Equity method investments | 510 |
| Fair Value, Inputs, Level 3 [Member] | Fair Value, Disclosure Item Amounts [Domain] | |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | |
| Assets, Fair Value Disclosure | $ 77 |