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Stock-Based Compensation Plans (Details Textuals) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation award number of shares available for future | 8,000,000 |  |
Stock-based compensation award vesting period | 3 years |  |
Realized tax benefits | $ 13 | $ 10 | $ 13
Tax benefit associated with stock-based compensation expense | $ 14 | 12 | 14
Stock option expiration period | 10 years |  |
Stock options granted in period (shares) | 0 |  |
Share-based liabilities paid | $ 2 |  | $ 0
EDCP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Deferral period (years) | 3 years |  |
DCPD |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Net liability recognized | $ 7 | $ 9 |
Performance-based Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award paid in stock (percent) | 66.67% |  |
Award paid in cash (percent) | 33.33% |  |
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation award vesting period | 3 years |  |
Liability recognized | $ 14 |  |
Granted (in dollars per share) | $ 34.77 | $ 35.27 | $ 32.17
Fair value of restricted stock units vested | $ 36 | $ 22 | $ 28
Unrecognized cost | $ 47 |  |
Unrecognized cost, period for recognition | 2 years |  |
Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Remaining contractual life | 3 years 7 months 6 days |  |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation award vesting period | 3 years |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in dollars per share) | $ 32.69 | $ 32.98 | $ 32.71
Fair value of restricted stock units vested | $ 5 | $ 8 | $ 4
Unrecognized cost | $ 2 |  |
Unrecognized cost, period for recognition | 3 years |  |
Weighted average vesting period (years) | 3 years 5 months 27 days |  |
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation award vesting period | 1 year |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation award vesting period | 10 years |  |
FES |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Tax benefit associated with stock-based compensation expense | $ 2 | $ 2 | $ 2
ICP 2007 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum limit of total stock awards (in shares) | 29,000,000 |  |
ICP 2015 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Maximum limit of total stock awards (in shares) | 10,000,000 |  |
401(k) Savings Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized for issuance | 1,159,215 | 1,072,494 |

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