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Stock Compensation - Total Stock Compensation Expense and Other Annual Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock compensation expense $ 23 $ 17 $ 14
Total grant-date fair value of awards vested 17 11 21
Cash received from exercise of stock options 10 2 2
Cash paid to settle SARs and RSUs 4 1 2
Stock Option And Stock Appreciation Rights [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of stock options and SARs exercised 8 1 1
Restricted Stock Units (RSUs) and Performance Share Units (PSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Intrinsic value of RSUs and PSUs vested $ 20 $ 7 $ 16