Basis of Presentation (Policies)	3 Months Ended
Mar. 31, 2012
Basis of Presentation [Abstract]
Offsetting Derivative Positions	In accordance with the applicable accounting guidance, we take into account the impact of bilateral collateral and master netting agreements that allow us to settle all derivative contracts held with a single counterparty on a net basis, and to offset the net derivative position with the related collateral when recognizing derivative assets and liabilities. Additional information regarding derivative offsetting is provided in Note 7 (“Derivatives and Hedging Activities”).
Fair value measurement	*Fair value measurement.* In May 2011, the FASB issued accounting guidance that changes the wording used to describe many of the current accounting requirements for measuring fair value and disclosing information about fair value measurements. This accounting guidance clarifies the FASB’s intent about the application of existing fair value measurement requirements. It is effective for the interim and annual periods beginning on or after December 15, 2011 (effective January 1, 2012, for us). The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations.
Presentation of comprehensive income	*Presentation of comprehensive income.* In June 2011, the FASB issued new accounting guidance that requires all nonowner changes in shareholders’ equity to be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. This new accounting guidance does not change any of the components currently recognized in net income or comprehensive income. It is effective for public entities for interim and annual periods beginning after December 15, 2011 (effective January 1, 2012, for us) as well as interim and annual periods thereafter. New consolidated Statements of Comprehensive Income (Unaudited) are now included as part of our financial statements as required by this accounting guidance.
Testing goodwill for impairment	*Testing goodwill for impairment.* In September 2011, the FASB issued new accounting guidance that simplifies how an entity will test goodwill for impairment. It permits an entity to first assess qualitative factors to determine whether additional goodwill impairment testing is required. This accounting guidance is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011 (effective January 1, 2012, for us). The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations.
Repurchase agreements	*Repurchase agreements.* In April 2011, the FASB issued accounting guidance that changed the accounting for repurchase agreements and other similar arrangements by eliminating the collateral maintenance requirement when assessing effective control in these transactions. This change could result in more of these transactions being accounted for as secured borrowings instead of sales. This accounting guidance is effective for new transactions and transactions that are modified on or after the first interim or annual period beginning after December 15, 2011 (effective January 1, 2012, for us). The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations since we do not account for these types of arrangements as sales.
Offsetting disclosures	*Offsetting disclosures.* In December 2011, the FASB issued new accounting guidance that requires an entity to disclose information about offsetting and related arrangements to enable financial statement users to understand the effect of those arrangements on the entity’s financial position. This new accounting guidance will be effective for annual reporting periods beginning on or after January 1, 2013 and interim periods within those annual periods (effective January 1, 2013 for us).

Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2012

In accordance with the applicable accounting guidance, we take into account the impact of bilateral collateral and master netting agreements that allow us to settle all derivative contracts held with a single counterparty on a net basis, and to offset the net derivative position with the related collateral when recognizing derivative assets and liabilities. Additional information regarding derivative offsetting is provided in Note 7 (“Derivatives and Hedging Activities”).

Fair value measurement

Fair value measurement. In May 2011, the FASB issued accounting guidance that changes the wording used to describe many of the current accounting requirements for measuring fair value and disclosing information about fair value measurements. This accounting guidance clarifies the FASB’s intent about the application of existing fair value measurement requirements. It is effective for the interim and annual periods beginning on or after December 15, 2011 (effective January 1, 2012, for us). The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations.

Presentation of comprehensive income

Presentation of comprehensive income. In June 2011, the FASB issued new accounting guidance that requires all nonowner changes in shareholders’ equity to be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. This new accounting guidance does not change any of the components currently recognized in net income or comprehensive income. It is effective for public entities for interim and annual periods beginning after December 15, 2011 (effective January 1, 2012, for us) as well as interim and annual periods thereafter. New consolidated Statements of Comprehensive Income (Unaudited) are now included as part of our financial statements as required by this accounting guidance.

Testing goodwill for impairment

Testing goodwill for impairment. In September 2011, the FASB issued new accounting guidance that simplifies how an entity will test goodwill for impairment. It permits an entity to first assess qualitative factors to determine whether additional goodwill impairment testing is required. This accounting guidance is effective for annual and interim goodwill impairment tests performed for fiscal years beginning after December 15, 2011 (effective January 1, 2012, for us). The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations.

Repurchase agreements

Repurchase agreements. In April 2011, the FASB issued accounting guidance that changed the accounting for repurchase agreements and other similar arrangements by eliminating the collateral maintenance requirement when assessing effective control in these transactions. This change could result in more of these transactions being accounted for as secured borrowings instead of sales. This accounting guidance is effective for new transactions and transactions that are modified on or after the first interim or annual period beginning after December 15, 2011 (effective January 1, 2012, for us). The adoption of this accounting guidance did not have a material effect on our financial condition or results of operations since we do not account for these types of arrangements as sales.

Offsetting disclosures

Offsetting disclosures. In December 2011, the FASB issued new accounting guidance that requires an entity to disclose information about offsetting and related arrangements to enable financial statement users to understand the effect of those arrangements on the entity’s financial position. This new accounting guidance will be effective for annual reporting periods beginning on or after January 1, 2013 and interim periods within those annual periods (effective January 1, 2013 for us).