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Derivative Financial Instruments and Hedging Activities (Schedule of Terminated Cash Flows) (Details) - Accumulated Net Gain (Loss) from Derivative Instruments Designated as Cash Flow Hedges [Member] - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax | $ 279 | $ 70 | $ 121 | $ 78
Other Comprehensive Income (loss), Unrealized Gain (loss) on terminated cash flow hedges arising during the period, before tax | 249 | 0 | 415 | (6)
Other Comprehensive Income (loss), Reclassification Adjustment from AOCI on terminated cash flow hedges, before tax | (34) | (2) | (42) | (4)
Accumulated Other Comprehensive Income related to discontinued cash flow hedges, before tax | $ 494 | $ 68 | $ 494 | $ 68

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