Financing Receivables (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) agreement	Dec. 31, 2018 USD ($)
Schedule of Financing Receivables [Line Items]
Financing receivable	$ 109	$ 116
Number of Foninvemem Agreements | agreement	3
Foninvemem Agreement, collection period	10 years
ARGENTINA
Schedule of Financing Receivables [Line Items]
Financing receivable	$ 64	93
Derivative Assets, Gross	94	199
Gener Subsidiary [Member]
Schedule of Financing Receivables [Line Items]
Financing receivable	33	0
Other Entity [Member]
Schedule of Financing Receivables [Line Items]
Financing receivable	$ 12	$ 23