Derivative Instruments - Schedule of Derivative Instruments Measured at Fair Value in Consolidated Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Derivative Assets
Fair Value	$ 7	$ 2
Derivative Liabilities
Fair Value	(81)	(162)
Level 2 \| Cross-currency swap agreements \| Derivatives designated as hedges: \| Other Long Term Assets and Other Long Term Liabilities
Derivatives, Fair Value [Line Items]
Notional Amount	1,270	1,304
Level 2 \| Cross-currency swap agreements \| Derivatives designated as hedges: \| Other long-term assets
Derivative Assets
Fair Value	0	0
Level 2 \| Cross-currency swap agreements \| Derivatives designated as hedges: \| Other long-term liabilities
Derivative Liabilities
Fair Value	(81)	(146)
Level 2 \| Foreign currency option and forward contracts \| Derivatives not designated as hedges: \| Other Current Assets and Other Current Liabilities
Derivatives, Fair Value [Line Items]
Notional Amount	473	1,038
Level 2 \| Foreign currency option and forward contracts \| Derivatives not designated as hedges: \| Other current assets
Derivative Assets
Fair Value	7	2
Level 2 \| Foreign currency option and forward contracts \| Derivatives not designated as hedges: \| Other current liabilities
Derivative Liabilities
Fair Value	$ 0	$ (16)

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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