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Stock Compensation Plans Compensation Expense (Details 1) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Payment Arrangement [Abstract]      
Stock-based compensation expense $ 127 $ 86 $ 94
Tax benefits from stock-based compensation expense 14 $ 27 $ 48
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 101    
Weighted-average period for unrecognized compensation expense to be charged to expense 1 year 3 months 18 days