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Pension Plans and Postretirement Other Than Pensions (Tables) | 6 Months Ended
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Jun. 30, 2012
Pension Plans |
Pension and Other Postretirement Benefits |
Expense Components for Pension Plan | Expense components are:
| Three months ended June 30, |  | Six months ended June 30,
(in millions) | 2012 |  | 2011 |  | 2012 |  | 2011
Service cost | $ | 37 |  |  | $ | 38 |  |  | $ | 74 |  |  | $ | 76 |
Interest cost | 45 |  |  | 47 |  |  | 90 |  |  | 94 |
Expected return on plan assets | (55 | ) |  | (56 | ) |  | (110 | ) |  | (112 | )
Amortization of prior service cost | 1 |  |  | 2 |  |  | 2 |  |  | 4 |
Amortization of net loss | 15 |  |  | 4 |  |  | 30 |  |  | 8 |
Expense under accounting standards | $ | 43 |  |  | $ | 35 |  |  | $ | 86 |  |  | $ | 70 |
Regulatory adjustment (deferred) | 27 |  |  | (6 | ) |  | 54 |  |  | (12 | )
Total expense recognized | $ | 70 |  |  | $ | 29 |  |  | $ | 140 |  |  | $ | 58 |
Postretirement Benefits Other Than Pensions |
Pension and Other Postretirement Benefits |
Expense Components for Pension Plan | Expense components are:
| Three months ended June 30, |  | Six months ended June 30,
(in millions) | 2012 |  | 2011 |  | 2012 |  | 2011
Service cost | $ | 12 |  |  | $ | 10 |  |  | $ | 24 |  |  | $ | 20 |
Interest cost | 28 |  |  | 31 |  |  | 56 |  |  | 62 |
Expected return on plan assets | (27 | ) |  | (27 | ) |  | (54 | ) |  | (54 | )
Amortization of prior service credit | (9 | ) |  | (9 | ) |  | (18 | ) |  | (18 | )
Amortization of net loss | 11 |  |  | 9 |  |  | 22 |  |  | 18 |
Total expense | $ | 15 |  |  | $ | 14 |  |  | $ | 30 |  |  | $ | 28 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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