Stock Repurchase Program	6 Months Ended
Jun. 30, 2020
Stock Repurchase Program [Abstract]
Stock Repurchase Program	Stock Repurchase Program We repurchased and retired 3.9 million and 5.7 million shares of Common Stock under our stock repurchase program during the first six months of 2020 and 2019, respectively, at a cost of $669 million and $1.1 billion, respectively.

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

Name:	us-gaap_TreasuryStockTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration