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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Statement of Other Comprehensive Income [Abstract] |  |  |  |
Net loss arising during period, tax benefit | $ 3 |  | $ 3 |
Amortization of net loss included in net income, tax expense (benefit) | $ 1 | $ 1 | $ 3 | $ 1

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