Credit Losses (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Beginning balance as of January 1	$ 11
Current period provision	22
Current period write offs	(12)
Recoveries of amounts previously reserved	(8)
Ending balance as of September 30	25
Cumulative-effect adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Beginning balance as of January 1	12
JIB Receivables
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current period provision	10
Trade Receivables
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Current period provision	$ 12