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Derivative Instruments And Hedging Activities (Fair Value Amounts Of Derivative Instruments Reported On Our Condensed Consolidated Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset $ 233 $ 263
Derivative Liability, Fair Value, Gross Liability 145 252
Derivative, Notional Amount 59,116 81,200
Accrued Interest [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 46 50
Derivative Liability, Fair Value, Gross Liability 12 17
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 126 118
Derivative Liability, Fair Value, Gross Liability 10 7
Derivative, Notional Amount 14,340 18,764
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 126 118
Derivative Liability, Fair Value, Gross Liability 9 7
Derivative, Notional Amount 14,151 18,554
Hedge notional amount associated with debt maturing in five or more years 2,600  
Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Derivative Liability, Fair Value, Gross Liability 1 0
Derivative, Notional Amount 189 210
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Pay-fixed Swaps, Fair Value, Gross Asset 13 21
Pay-fixed Swaps, Fair Value, Gross Liability 3 6
Pay-fixed Swaps, Notional Amount 6,800 13,900
Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 105 138
Derivative Liability, Fair Value, Gross Liability 125 161
Derivative, Notional Amount 44,466 60,847
Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 5
Derivative Liability, Fair Value, Gross Liability 0 78
Derivative, Notional Amount 278 1,514
Equity Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 2 2
Derivative Liability, Fair Value, Gross Liability 10 6
Derivative, Notional Amount 32 75
Interest Rate Swap [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 30 40
Derivative Liability, Fair Value, Gross Liability 51 65
Derivative, Notional Amount 6,101 11,979
Futures and Forwards [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 2 4
Derivative Liability, Fair Value, Gross Liability 2 2
Derivative, Notional Amount 1,905 18,886
Written Options [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Derivative Liability, Fair Value, Gross Liability 72 94
Derivative, Notional Amount 18,220 14,823
Written Options [Member] | Equity Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Derivative Liability, Fair Value, Gross Liability 1 3
Derivative, Notional Amount 0 1
Purchased Options [Member] | Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 73 94
Derivative Liability, Fair Value, Gross Liability 0 0
Derivative, Notional Amount 18,240 15,159
Purchased Options [Member] | Equity Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 2 2
Derivative Liability, Fair Value, Gross Liability 0 0
Derivative, Notional Amount 0 0
Forward Contracts [Member] | Equity Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Derivative Liability, Fair Value, Gross Liability 9 3
Derivative, Notional Amount 32 74
Swap [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 0
Derivative Liability, Fair Value, Gross Liability 0 74
Derivative, Notional Amount 0 1,210
Foreign Exchange Forward [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 0 5
Derivative Liability, Fair Value, Gross Liability 0 4
Derivative, Notional Amount 278 304
Other Trading [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset 107 145
Derivative Liability, Fair Value, Gross Liability 135 245
Derivative, Notional Amount 44,776 62,436
Unsecured Debt [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Receive-fixed Swaps, Fair Value, Gross Asset 112 97
Receive-fixed Swaps, Fair Value, Gross Liability 3 1
Receive-fixed Swaps, Notional Amount 6,800 $ 4,700
Secured Debt [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Receive-fixed Swaps, Fair Value, Gross Asset 1  
Receive-fixed Swaps, Fair Value, Gross Liability 2  
Receive-fixed Swaps, Notional Amount $ 500