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Share-Based Compensation (Restricted Share Activity) (Details) - Restricted Stock [Member]
shares in Millions
12 Months Ended
Dec. 31, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested at beginning of period | shares 4
Granted | shares 2
Vested | shares (2)
Nonvested at end of period | shares 4
Nonvested at beginning of period, Weighted-Average Grant Date Fair Value per Share | $ / shares $ 256
Weighted-average grant date fair value per share | $ / shares 352
Vested, Weighted Average Grant Date Fair Value per share | $ / shares 246
Nonvested at end of period, Weighted-Average Grant Date Fair Value per Share | $ / shares $ 303