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 |