Additional Information (Schedule of Rental Commitments and Sublease Income Under Non-Cancelable Operating Leases) (Details) $ in Millions	Dec. 31, 2018 USD ($)
Rental Commitments
2019	$ 41
2020	35
2021	31
2022	24
2023	17
Thereafter	34
Total	182
Sublease Income
2019	5
2020	5
2021	5
2022	5
2023	5
Thereafter	2
Total	$ 27

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 10
-Section 55
-Paragraph 40
-Subparagraph (Note 3)
-URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717