Financial Statement Presentation Cash, Cash Equivalents, and Restricted Cash (Tables)

3 Months Ended

Mar. 31, 2019

Cash and Cash Equivalents [Abstract]

Schedule of Cash and Cash Equivalents [Table Text Block]

Cash, Cash Equivalents, and Restricted Cash — The following table provides a summary of cash, cash equivalents, and restricted cash amounts reported on the Condensed Consolidated Balance Sheet that reconcile to the total of such amounts as shown on the Condensed Consolidated Statements of Cash Flows (in millions):

	March 31, 2019		December 31, 2018
Cash and cash equivalents	$	1,426	$	1,166
Restricted cash	519		370
Debt service reserves and other deposits	430		467
Cash, Cash Equivalents, and Restricted Cash	$	2,375	$	2,003