Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Significant Accounting Policies [Abstract]

Restrictions on Cash and Cash Equivalents [Table Text Block]

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Statements of Financial Position that sum to the total of the same such amounts shown on the Consolidated Statements of Cash Flows:

Millions		2019	2018		2017
Cash and cash equivalents	$	831	$	1,273	$	1,275
Restricted cash equivalents in other current assets		13		42		-
Restricted cash equivalents in other assets		12		13		-
Total cash, cash equivalents and restricted cash ‎ equivalents shown on the Statement of Cash Flows:	$	856	$	1,328	$	1,275