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Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 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
Numerator:
Net income (1)	$ 161	$ 187	$ 179	$ 42	$ 170	$ 50	$ (121)	$ 90	$ 569	$ 189	$ 1,140
Denominator:
Weighted average basic shares									296.6	312.9	328.7
Effect of dilutive securities									1.8	1.6	1.7
Weight average diluted shares									298.4	314.5	330.4
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
New Accounting Pronouncement, Impact on Net Income										$ 1	$ 15
New Accounting Pronouncement, Impact on Diluted Earnings Per Share										$ 0.00	$ 0.04
Treasury Stock, Shares, Acquired									28.1	19.1	18.7
Payments for Repurchase of Common Stock									$ 535	$ 375	$ 380
Shares excluded from EPS calculation (in millions):
Basic earnings per share	$ 0.56	$ 0.63	$ 0.60	$ 0.14	$ 0.55	$ 0.16	$ (0.39)	$ 0.28	$ 1.92	$ 0.60	$ 3.47
Diluted earnings per share(1)(2)	$ 0.56	$ 0.63	$ 0.59	$ 0.14	$ 0.55	$ 0.16	$ (0.39)	$ 0.28	$ 1.91	$ 0.60	$ 3.45

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