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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended			36 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Sep. 19, 2019	Dec. 08, 2017	Dec. 07, 2016	Sep. 10, 2015
Stock repurchase program, period in force												3 years
Net income (1)	$ 161	$ 187	$ 179	$ 42	$ 170	$ 50	$ (121)	$ 90	$ 569	$ 189	$ 1,140
Stock Repurchase Program, Authorized Amount													$ 800	$ 750	$ 500	$ 250
Payments for Repurchase of Common Stock									$ 535	$ 375	$ 380
Common Stock reserved for issuance	18,300,000								18,300,000			18,300,000
Treasury Stock, Shares, Acquired									28,100,000	19,100,000	18,700,000
Treasury Stock, Shares	144,600,000				116,000,000				144,600,000	116,000,000		144,600,000
Accelerated Share Repurchases, Final Price Paid Per Share									$ 19.02	$ 19.60	$ 20.36

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