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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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