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Stock Transactions And Stock-Based Compensation (Components Of Share-Based Compensation Program) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Pretax compensation expense | $ 187 | $ 159 | $ 138
Income tax benefit | (39) | (33) | (28)
Total stock-based compensation expense, net of income taxes | 148 | 126 | 110
RSUs/PSUs |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Pretax compensation expense | 114 | 97 | 86
Income tax benefit | (24) | (20) | (17)
Total stock-based compensation expense, net of income taxes | 90 | 77 | 69
Stock options |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Pretax compensation expense | 73 | 62 | 52
Income tax benefit | (15) | (13) | (11)
Total stock-based compensation expense, net of income taxes | $ 58 | $ 49 | $ 41

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