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Restructuring Costs - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 15 Months Ended |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | $ 3 | $ 25 |  |
IT Restructuring |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve | 5 |  | $ 5 | $ 6
2017 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Reserve |  |  |  | $ 18
Other segment | IT Restructuring |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Expected restructuring costs | 15 |  | 15 |
Decrease to estimated expected costs remaining | 20 |  |  |
Restructuring costs | 2 |  | 11 |
One-Time Termination Benefits | Other segment | IT Restructuring |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 2 |  | 7 |
Consulting Fees | Other segment | IT Restructuring |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 1 |  | 4 |
Other Restructuring Costs | 2017 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 1 |  |  |
Contract Termination | 2017 Restructuring Plan |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring costs | 3 |  |  |
Restructuring Reserve | $ 16 |  | $ 16 |

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- Definition Amount, after cash payment, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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