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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liabilities recorded for interest related to uncertain tax positions |  |  |  |  | $ 0 |  |  |  |  | $ 0 | $ 0
Liabilities recorded for penalties related to uncertain tax positions |  |  |  |  | 0 |  |  |  |  | 0 | 0
Current tax provision: |  |  |  |  |  |  |  |  |  |  |
Federal and foreign |  |  |  |  |  |  |  |  | $ 734 | 738 | 653
State and local |  |  |  |  |  |  |  |  | 114 | 129 | 101
Total current tax provision |  |  |  |  |  |  |  |  | 848 | 867 | 754
Deferred tax expense: |  |  |  |  |  |  |  |  |  |  |
Federal and foreign |  |  |  |  |  |  |  |  | (170) | (209) | (125)
State and local |  |  |  |  |  |  |  |  | (19) | (19) | (27)
Total deferred tax expense |  |  |  |  |  |  |  |  | (189) | (228) | (152)
Income tax expense | $ 169 | $ 171 | $ 152 | $ 167 | 161 | $ 156 | $ 162 | $ 160 | $ 659 | $ 639 | $ 602
Effective income tax rate: |  |  |  |  |  |  |  |  |  |  |
Federal statutory income tax rate (as a percent) |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
State income taxes-net of federal effect (as a percent) |  |  |  |  |  |  |  |  | 3.60% | 4.00% | 3.10%
Other (as a percent) |  |  |  |  |  |  |  |  | (0.60%) | 0.70% | 0.30%
Effective income tax rate (as a percent) |  |  |  |  |  |  |  |  | 38.00% | 39.70% | 38.40%
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | (1,431) |  |  |  | (1,380) |  |  |  | $ (1,431) | $ (1,380) |
Intangibles assets | (1,153) |  |  |  | (1,449) |  |  |  | (1,153) | (1,449) |
Receivable from an affiliate due to pension plan participation | (460) |  |  |  | (500) |  |  |  | (460) | (500) |
Other | (59) |  |  |  | (52) |  |  |  | (59) | (52) |
Total deferred tax liabilities | (3,103) |  |  |  | (3,381) |  |  |  | (3,103) | (3,381) |
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |
Payable to affiliate due to post-retirement plan participation | 921 |  |  |  | 998 |  |  |  | 921 | 998 |
Debt premiums | 21 |  |  |  | 36 |  |  |  | 21 | 36 |
Other | 277 |  |  |  | 274 |  |  |  | 277 | 274 |
Total deferred tax assets | 1,219 |  |  |  | 1,308 |  |  |  | 1,219 | 1,308 |
Valuation allowance on deferred tax assets | (12) |  |  |  | (12) |  |  |  | (12) | (12) |
Net deferred tax assets | 1,207 |  |  |  | 1,296 |  |  |  | 1,207 | 1,296 |
Net deferred tax liabilities | (1,896) |  |  |  | $ (2,085) |  |  |  | (1,896) | $ (2,085) |
Domestic tax authority |  |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |
Liabilities recorded for interest related to uncertain tax positions | 0 |  |  |  |  |  |  |  | 0 |  |
Liabilities recorded for penalties related to uncertain tax positions | $ 0 |  |  |  |  |  |  |  | $ 0 |  |

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