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Restructuring and Separation Costs - Separation Costs (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and separation costs	$ 73	$ 118	$ 43	$ 0	$ 234	$ 0	$ 0
Charges					150
Separation Costs - Former Executives
Restructuring Cost and Reserve [Line Items]
Restructuring and separation costs					36
Charges					13
Acceleration of share-based compensation					$ 23
Deferred termination fee | Executive Officers
Restructuring Cost and Reserve [Line Items]
Cash awards as a percentage of base salary					400.00%
Deferred bonus | Chief Executive Officer
Restructuring Cost and Reserve [Line Items]
Cash awards as a percentage of base salary					150.00%
Deferred bonus | Chief Financial Officer
Restructuring Cost and Reserve [Line Items]
Cash awards as a percentage of base salary					125.00%

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
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-Topic 230
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-Section 45
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+ References

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-Name Accounting Standards Codification
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Amount of decrease in the reserve for full or partial settlement through consideration other than cash.

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