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Stock Compensation - Total Stock Compensation Expense and Other Annual Disclosures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock compensation expense $ 16 $ 23 $ 17
Total grant-date fair value of awards vested 16 17 11
Cash received from exercise of stock options 2 10 2
Cash paid to settle SARs and RSUs 2 4 1
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 3 8 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 $ 18 $ 20 $ 7