Customer Deposits (Details 3) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Time Deposits $250,000 Or More [Line Items]
Time Deposits, $250,000 or More	$ 502	$ 285
United States [Member]
Time Deposits $250,000 Or More [Line Items]
Time Deposits, $250,000 or More	496	276
Non-US [Member]
Time Deposits $250,000 Or More [Line Items]
Time Deposits, $250,000 or More	$ 6	$ 9

Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818

Name:	us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant