Fair Value Measurements (Reconciliation Of Net Beginning And Ending Balances Recorded For Net Assets And Liabilities Classified As Level 3) (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Fair Value, Assets Measured On Recurring, Basis Unobservable Input Reconcilation Calculation Roll Forward [Abstract] | ||||||||
Beginning balance | $ 2,764 | $ 2,402 | ||||||
Total realized and unrealized gains included in net income | (2) | 1 | (2) | |||||
Purchases of PFD Preferred Stock | 6,972 | [1] | 10,326 | [1] | ||||
Redemptions of PFD Preferred Stock | (9,737) | [1] | (12,730) | [1] | ||||
Settlements of derivative instruments | 2 | (2) | 2 | |||||
Ending balance | (2) | (2) | ||||||
Unrealized gains or losses included in net income | ||||||||
Unrealized gains or losses included in net income | $ 0 | $ (1) | $ 0 | $ (2) | ||||
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