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Restructuring and Separation Costs - Restructuring Costs by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs | $ 8 | $ 5 | $ 8 | $ 25 | $ 73 | $ 118 | $ 43 | $ 0 | $ 46 | $ 234 | $ 0 |
IT Restructuring | Other |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 9 |  |  |
IT Restructuring | Other | One-Time Termination Benefits |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 7 |  |  |
IT Restructuring | Other | Consulting Fees |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 2 |  |  |
2017 Restructuring Plan |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 37 | 234 |  | $ 271
2017 Restructuring Plan | Separation Costs - Former Executives |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 0 | 36 |  | 36
2017 Restructuring Plan | One-Time Termination Benefits |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 5 | 67 |  | 72
2017 Restructuring Plan | Write-offs of Current and Long-lived Assets |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 19 | 61 |  | 80
2017 Restructuring Plan | Consulting Fees |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 1 | 44 |  | 45
2017 Restructuring Plan | Contract Termination Costs |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 12 | 26 |  | 38
2017 Restructuring Plan | Health Plans |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 11 | 73 |  | 84
2017 Restructuring Plan | Health Plans | Separation Costs - Former Executives |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 0 | 0 |  | 0
2017 Restructuring Plan | Health Plans | One-Time Termination Benefits |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 0 | 33 |  | 33
2017 Restructuring Plan | Health Plans | Write-offs of Current and Long-lived Assets |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | (1) | 16 |  | 15
2017 Restructuring Plan | Health Plans | Consulting Fees |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 0 | 0 |  | 0
2017 Restructuring Plan | Health Plans | Contract Termination Costs |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 12 | 24 |  | 36
2017 Restructuring Plan | Other |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 26 | 161 |  | 187
2017 Restructuring Plan | Other | Separation Costs - Former Executives |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 0 | 36 |  | 36
2017 Restructuring Plan | Other | One-Time Termination Benefits |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 5 | 34 |  | 39
2017 Restructuring Plan | Other | Write-offs of Current and Long-lived Assets |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 20 | 45 |  | 65
2017 Restructuring Plan | Other | Consulting Fees |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | 1 | 44 |  | 45
2017 Restructuring Plan | Other | Contract Termination Costs |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and separation costs |  |  |  |  |  |  |  |  | $ 0 | $ 2 |  | $ 2

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