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Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents (Tables)
9 Months Ended
Sep. 30, 2018
Cash and Cash Equivalents [Abstract]  
Schedule of Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents
The following table provides a reconciliation of cash, cash equivalents, restricted cash and restricted cash equivalents reported within the statement of financial position that total to the beginning of period and end of period amounts shown in the statement of cash flows.
 
December 31,
 
2017
 
2016
 
(in millions)
Cash and cash equivalents
$
5,933

 
$
6,721

Restricted cash and restricted cash equivalents
 
 
 
Restricted cash for litigation settlement
546

 
543

Restricted security deposits held for customers
1,085

 
991

Prepaid expenses and other current assets
28

 
3

Other assets

 
15

Cash, cash equivalents, restricted cash and restricted cash equivalents - beginning of period 1
$
7,592

 
$
8,273

 
 
 
 
 
September 30,
 
2018
 
2017
 
(in millions)
Cash and cash equivalents
$
6,871

 
$
5,559

Restricted cash and restricted cash equivalents
 
 
 
Restricted cash for litigation settlement
550

 
545

Restricted security deposits held for customers
1,034

 
1,026

Prepaid expenses and other current assets
23

 
61

Cash, cash equivalents, restricted cash and restricted cash equivalents - end of period 1
$
8,478

 
$
7,191

1 As shown on the consolidated statement of cash flows.