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Summary of Significant Accounting Policies and Other Matters - Earnings Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]      
Net income $ 1,382 $ 1,525 $ 1,245
Weighted average common shares outstanding – basic (in shares) 311.7 307.1 300.4
Add: Incremental shares attributable to effect of potentially dilutive securities (in shares) 1.2 1.7 1.5
Adjusted weighted average common shares outstanding – diluted (in shares) 312.9 308.8 301.9
Net income per common share — basic (in dollars per share) $ 4.43 $ 4.97 $ 4.15
Net income per common share — diluted (in dollars per share) $ 4.42 $ 4.94 $ 4.12