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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