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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Mar. 31, 2011 Predecessor
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Liabilities recorded for interest related to uncertain tax positions |  |  |  |  | $ 5 |  |  |  |  |  | $ 5 |
Current tax provision: |  |  |  |  |  |  |  |  |  |  |  |
Federal and foreign |  |  |  |  |  |  |  |  | 173 | 653 | 638 | 104
State and local |  |  |  |  |  |  |  |  | 26 | 101 | 105 | 11
Total current tax provision |  |  |  |  |  |  |  |  | 199 | 754 | 743 | 115
Deferred tax expense (benefit): |  |  |  |  |  |  |  |  |  |  |  |
Federal and foreign |  |  |  |  |  |  |  |  | 128 | (125) | (175) | 61
State and local |  |  |  |  |  |  |  |  | 22 | (27) | (26) | 15
Total deferred tax expense (benefit) |  |  |  |  |  |  |  |  | 150 | (152) | (201) | 76
Income tax expense | 142 | 139 | 155 | 166 | 160 | 133 | 113 | 136 | 349 | 602 | 542 | 191
Effective income tax rate: |  |  |  |  |  |  |  |  |  |  |  |
Federal statutory income tax rate (as a percent) |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00% | 35.00%
State income taxes-net of federal effect (as a percent) |  |  |  |  |  |  |  |  | 3.50% | 3.10% | 3.70% | 3.40%
Other (as a percent) |  |  |  |  |  |  |  |  | 0.60% | 0.30% | 0.30% | 0.60%
Effective income tax rate (as a percent) |  |  |  |  |  |  |  |  | 39.10% | 38.40% | 39.00% | 39.00%
Deferred tax liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | (1,281) |  |  |  | (1,179) |  |  |  |  | (1,281) | (1,179) |
Intangibles assets | (1,772) |  |  |  | (2,118) |  |  |  |  | (1,772) | (2,118) |
Receivable from an affiliate due to pension plan participation | (462) |  |  |  | (397) |  |  |  |  | (462) | (397) |
Other | (52) |  |  |  | (61) |  |  |  |  | (52) | (61) |
Total deferred tax liabilities | (3,567) |  |  |  | (3,755) |  |  |  |  | (3,567) | (3,755) |
Deferred tax assets: |  |  |  |  |  |  |  |  |  |  |  |
Payable to affiliate due to post-retirement benefit plan participation | 983 |  |  |  | 982 |  |  |  |  | 983 | 982 |
Debt premiums | 55 |  |  |  | 67 |  |  |  |  | 55 | 67 |
Other | 229 |  |  |  | 253 |  |  |  |  | 229 | 253 |
Total deferred tax assets | 1,267 |  |  |  | 1,302 |  |  |  |  | 1,267 | 1,302 |
Valuation allowance on deferred tax assets | (12) |  |  |  | (12) |  |  |  |  | (12) | (12) |
Net deferred tax assets | 1,255 |  |  |  | 1,290 |  |  |  |  | 1,255 | 1,290 |
Net deferred tax liabilities | $ (2,312) |  |  |  | $ (2,465) |  |  |  |  | $ (2,312) | $ (2,465) |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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