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Derivative Instruments (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Derivative [Line Items]
Number of securities called by each warrant or right			84.5
Exercise price of warrants or rights			$ 6.43
Warrants and rights outstanding	$ 3			$ 3		$ 70
Fair Value Adjustment of Warrants	(11)	$ 7		(67)	$ (58)
Foreign currency forward contracts
Derivative [Line Items]
Notional amount	488			488		767
Fair Value Hedging [Member] \| Interest Rate Swap [Member]
Derivative [Line Items]
Debt Instrument, Unamortized Premium	0			0		$ 4
Cash Flow Hedging [Member] \| Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Deferred (gain) loss on discontinuation of fair value hedge	8			8
Other, Net \| Not Designated as Hedging Instrument \| Foreign currency forward contracts
Derivative [Line Items]
Derivative, Gain (Loss) on Derivative, Net	$ (5)	$ 2		$ (5)	$ (20)
Capital in Excess of Par Value
Derivative [Line Items]
Stock issued during period, shares, new issues			84.5