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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 | Jun. 30, 2020 | Dec. 31, 2019
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Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | $ 14 | $ 64
Fair value of derivative contracts in payable position | 2 | 5
Derivative, notional amount | 12,081 | 32,489
Designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 0 | 62
Fair value of derivative contracts in payable position | 0 | 3
Derivative, notional amount | 11,360 | 31,358
Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 14 | 2
Fair value of derivative contracts in payable position | 2 | 2
Derivative, notional amount | 721 | 1,131
Interest rate contracts | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 12 | 2
Fair value of derivative contracts in payable position | 0 | 0
Derivative, notional amount | 562 | 1,019
Interest rate swaps | Designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 0 | 0
Fair value of derivative contracts in payable position | 0 | 0
Derivative, notional amount | 11,215 | 17,101
Interest rate purchased options | Designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 0 | 62
Fair value of derivative contracts in payable position | 0 | 0
Derivative, notional amount | 0 | 14,100
Interest rate purchased options | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 0 | 0
Fair value of derivative contracts in payable position | 0 | 0
Derivative, notional amount | 0 | 416
Interest rate futures and forwards | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 0 | 0
Fair value of derivative contracts in payable position | 0 | 0
Derivative, notional amount | 117 | 81
Interest rate written options | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 12 | 2
Fair value of derivative contracts in payable position | 0 | 0
Derivative, notional amount | 445 | 522
Foreign exchange contracts | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 0 | 0
Fair value of derivative contracts in payable position | 0 | 2
Derivative, notional amount | 157 | 112
Foreign exchange forwards | Designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 0 | 0
Fair value of derivative contracts in payable position | 0 | 3
Derivative, notional amount | 145 | 157
Foreign exchange futures and forwards | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 0 | 0
Fair value of derivative contracts in payable position | 0 | 2
Derivative, notional amount | 157 | 112
Equity Contract | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 2 | 0
Fair value of derivative contracts in payable position | 2 | 0
Derivative, notional amount | 2 | 0
Equity Contract Put Option | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 0 | 0
Fair value of derivative contracts in payable position | 2 | 0
Derivative, notional amount | 1 | 0
Purchased Options | Not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Fair value of derivative contracts in receivable position | 2 | 0
Fair value of derivative contracts in payable position | 0 | 0
Derivative, notional amount | $ 1 | $ 0

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