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Goodwill and Other Intangible Assets - Schedule of Estimated Future Amortization Expense (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]    
Weighted-average amortization period 26 years  
Remaining 2019 $ 766  
2020 993  
2021 836  
2022 804  
2023 780  
Thereafter 10,120  
Total amortization related to finite-lived intangible assets 14,299  
Indefinite-lived intangible assets at March 31, 2019 1,645  
Net intangible assets at March 31, 2019 $ 15,944 $ 16,223