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Borrowings - Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 31, 2018
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
Aug. 17, 2018
Dec. 31, 2017
Nov. 30, 2017
Nov. 01, 2015
Dec. 31, 2011
Sep. 30, 2011
May 31, 2011
Debt Disclosure [Abstract]                      
Debt issuance costs   $ 17,000,000 $ 19,000,000                
Discounts on debt issuance   3,000,000                  
Fair value adjustment related to hedged debt   28,000,000 (8,000,000)                
Debt Instrument [Line Items]                      
Loss on extinguishment of debt   $ 126,000,000 $ 0 $ 0              
U.S. Dollar Global Notes                      
Debt Instrument [Line Items]                      
Aggregate principal amount of outstanding debt extinguished $ 1,850,000,000                    
4.65% notes due December 2021                      
Debt Instrument [Line Items]                      
Interest rate (percent)   4.65%             4.65%    
4.375% notes due September 2021                      
Debt Instrument [Line Items]                      
Interest rate (percent)   4.375%               4.375%  
4.300% notes due June 2021                      
Debt Instrument [Line Items]                      
Interest rate (percent)   4.30%                 4.30%
Commercial paper                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity   $ 6,000,000,000.0         $ 6,000,000,000.0 $ 4,000,000,000.0      
Credit Facility                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity           $ 1,500,000,000.0          
Terminated revolving credit agreement         $ 1,500,000,000            
Credit Facility | Senior unsecured committed revolving credit facility                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity   4,000,000,000.0                  
Credit Facility | Lines of credit                      
Debt Instrument [Line Items]                      
Uncommitted lines of credit   $ 667,000,000