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Debt and Financing Activities - Commercial Paper (Details) - USD ($)
3 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Debt Instrument [Line Items]    
Weighted average interest rate (percent) 2.43%  
Commercial Paper    
Debt Instrument [Line Items]    
Outstanding notes (up to) $ 3,500,000,000.0  
Proceeds from Issuance of Commercial Paper 9,000,000,000  
Repayments of Commercial Paper 7,000,000,000  
Commercial paper $ 2,000,000,000 $ 0