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Segment Information - Special Items (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Before-tax [Abstract]        
Integration and transaction-related costs $ 114 $ 128 $ 405 $ 318
Charges associated with litigation matters (30) 45 51 45
Total charges (benefits) associated with U.S. tax reform 0 2 0 2
Total impact from special items, before-tax 84 175 456 365
After-tax [Abstract]        
Integration and transaction-related costs 88 108 311 267
Charges associated with litigation matters (23) 35 41 35
Total charges (benefits) associated with U.S. tax reform 0 (5) 0 (5)
Total impact of special items, after-tax $ 65 $ 138 $ 352 $ 297