Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Restrictions on Cash and Cash Equivalents

The classification of restricted cash between current and non-current is dependent upon the intended use of each particular reserve.

Reconciliation to Statements of Cash Flows
	As of December 31,
(In millions)	2019		2018
Cash and cash equivalents	$	1,755	$	1,491
Restricted cash, current	117		115
Restricted cash, non-current	12		51
Total cash, cash equivalents, and restricted cash	$	1,884	$	1,657