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Other (Income) Expense, Net - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Other Income and Expenses [Abstract]          
Net gains on securities   $ 80 $ 25 $ 202 $ 74
Gain on settlement $ 115        
Interest paid       $ 535 $ 505