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Earnings per Share (Tables)
6 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Schedule of earnings per share, basic and diluted For the quarter and six months ended June 30, 2020, these shares are treated as issued and outstanding at January 1, 2020 for purposes of calculating historical basic and diluted earnings per share.
 Quarter Ended June 30,Six Months Ended June 30,
(dollars in millions, except per share amounts; shares in millions)2021202020212020
Net income attributable to common shareholders$326 $224 $634 $389 
Basic weighted average number of shares outstanding427.9 433.1 429.8 433.1 
Stock awards and equity units (share equivalent)3.7 1.0 2.9 0.5 
Diluted weighted average number of shares outstanding431.6 434.1 432.7 433.6 
Earnings Per Share of Common Stock:
Basic:$0.76 $0.52 $1.48 $0.90 
Diluted:$0.76 $0.52 $1.47 $0.90