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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalent (Tables)
 3 Months Ended
Dec. 31, 2018
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]  
Schedule of Cash and Cash Equivalents
The Company reconciles cash, cash equivalents, restricted cash and restricted cash equivalents reported in the consolidated balance sheets that aggregate to the beginning and ending balances shown in the consolidated statements of cash flows as follows:
 
December 31,
 
September 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Cash and cash equivalents
$
8,289

 
$
8,138

 
$
8,162

 
$
9,874

Restricted cash and restricted cash equivalents:
 
 
 
 
 
 
 
U.S. litigation escrow
1,496

 
883

 
1,491

 
1,031

Customer collateral
1,330

 
1,155

 
1,324

 
1,106

Cash, cash equivalents, restricted cash and restricted cash equivalents
$
11,115

 
$
10,176

 
$
10,977

 
$
12,011