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Debt - Narrative (Details) - USD ($)
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Aug. 13, 2018
Dec. 31, 2017
Line of Credit Facility [Line Items]        
Proceeds from commercial paper $ (35,000,000) $ (445,000,000)    
Senior notes 7,686,000,000     $ 6,100,000,000
Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity 3,400,000,000.0      
Debt issuance costs 2,000,000      
Additional borrowing capacity (up to) 975,000,000      
Amount of debt outstanding 0      
Amount required to stop broker-dealer subsidiary commitments 105,000,000      
Funds available to use for working capital and general and corporate purposes 2,100,000,000      
Commercial Paper | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Funds reserved for commercial paper program $ 1,200,000,000      
Weighted average interest rate 2.15%      
Weighted average maturity period 23 days      
Commercial Paper | Revolving Credit Facility | Minimum        
Line of Credit Facility [Line Items]        
Commercial paper maturities 1 day      
Commercial Paper | Revolving Credit Facility | Maximum        
Line of Credit Facility [Line Items]        
Commercial paper maturities 81 days      
Senior Notes        
Line of Credit Facility [Line Items]        
Debt issuance costs $ 21,000,000      
Senior notes     $ 2,250,000,000  
Senior Notes | 2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023)        
Line of Credit Facility [Line Items]        
Debt instrument, face amount     $ 400,000,000  
Interest rate, stated percentage 3.45%   3.45%  
Senior Notes | 2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028)        
Line of Credit Facility [Line Items]        
Debt instrument, face amount     $ 600,000,000  
Interest rate, stated percentage 3.75%   3.75%  
Senior Notes | 2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048)        
Line of Credit Facility [Line Items]        
Debt instrument, face amount     $ 1,250,000,000  
Interest rate, stated percentage 4.25%   4.25%  
Senior Notes | 2018 Senior Notes (2.50% senior unsecured notes due October 15, 2018)        
Line of Credit Facility [Line Items]        
Interest rate, stated percentage 2.50%   2.50%  
Aggregate principal amount to be funded upon redemption     $ 600,000,000  
BondPoint and TMC Bonds        
Line of Credit Facility [Line Items]        
Proceeds from commercial paper $ (35,000,000)