Equity and Comprehensive Income Equity and Comprehensive Income - Additional Information - Stock Repurchase Programs (Details) $ in Millions	May 07, 2017 USD ($)
Equity [Abstract]
Stock repurchase program, remaining authorized repurchase amount	$ 2,989

Amount remaining of a stock repurchase plan authorized.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant