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Goodwill, Other Intangibles, and Property and Equipment - Other Intangible Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Finite Lived Intangible Assets Net [Line Items]    
Finite-lived intangible assets, cost   $ 1,571
Finite-lived intangible assets, accumulated amortization $ 1,408 1,226
Finite-lived intangible assets, net   345
Indefinite-lived intangible assets, Express Scripts Trade Name 8,400  
Intangible assets, gross 40,411  
Intangible assets, net 39,003 345
Value of business acquired, cost 665 232
Value of business acquired, accumulated amortization 102 86
Value of business acquired, net 563 146
Total, cost 41,076 1,803
Total, accumulated amortization 1,510 1,312
Total, net 39,566 491
Customer relationships [Member]    
Finite Lived Intangible Assets Net [Line Items]    
Finite-lived intangible assets, cost 31,451 1,280
Finite-lived intangible assets, accumulated amortization 1,213 1,056
Finite-lived intangible assets, net 30,238 224
Other intangibles [Member]    
Finite Lived Intangible Assets Net [Line Items]    
Finite-lived intangible assets, cost 560 291
Finite-lived intangible assets, accumulated amortization 195 170
Finite-lived intangible assets, net $ 365 $ 121