(Impact of Derivative Instruments in Consolidated Balance Sheet Other) (Details) - USD ($) $ in Millions	Dec. 31, 2020		Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative assets	$ 5	[1]	$ 68	[2]
Derivative liabilities	9	[3]	7	[4]
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets	5		14
Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets			54
Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities	7		6
Other Liabilities
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 2		$ 1

[1] Includes $5 million recorded in Other current assets in the accompanying consolidated balance sheet.

[2] Included $14 million recorded in Other current assets and $54 million Deferred charges recorded in the accompanying consolidated balance sheet.

[3] Included $7 million recorded in Other current liabilities and $2 million recorded in Other liabilities the accompanying consolidated balance sheet.

[4] Included $6 million recorded in Other current liabilities and $1 million recorded in Other liabilities in the accompanying consolidated balance sheet.