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Restructuring Costs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring costs | $ 6 | $ 46 | $ 234
IT Restructuring |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cumulative restructuring costs | 12 |  |
Decrease to estimated expected costs remaining |  | 20 |
Accrued liabilities under restructuring plan | 1 | 6 |
Other restructuring costs | 3 |  |
IT Restructuring | One-Time Termination Benefits |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cumulative restructuring costs | 7 |  |
Payments for restructuring | 5 |  |
IT Restructuring | Consulting Fees |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Cumulative restructuring costs | 5 |  |
Payments for restructuring | 3 |  |
2017 Restructuring Plan |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accrued liabilities under restructuring plan |  | $ 18 |
2017 Restructuring Plan | Contract Termination |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Accrued liabilities under restructuring plan | 12 |  |
Payments for restructuring | 9 |  |
Restructuring costs | $ 3 |  |

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