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Equity Stock Repurchases (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended		31 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Feb. 26, 2018	Feb. 23, 2017	Feb. 24, 2016
Stock Repurchases [Line Items]
Shares Repurchased and Retired During Period, Shares	4.7		12.5		29.0
Shares Repurchased and Retired During Period, Value	$ 102	$ 59	$ 302	$ 180	$ 776
Weighted Average Market Price of Shares Repurchased and Retired During Period	$ 21.37		$ 24.07		$ 26.74
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 149		$ 149		$ 149
Maximum | 2016 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Authorized under Stock Repurchase Program,								$ 275
Maximum | 2017 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Authorized under Stock Repurchase Program,							$ 300
Maximum | 2018 Stock Repurchase Plan
Stock Repurchases [Line Items]
Shares Authorized under Stock Repurchase Program,						$ 350

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