Hedges and Derivative Financial Instruments (Narrative) (Details) € in Millions	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2016 EUR (€) contract	Dec. 31, 2016 USD ($) contract	Dec. 31, 2015 contract
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Number of interest rate derivatives held (in contract) | contract		0	0	0
Derivative net hedge ineffectiveness	$ 0
Derivative instruments, loss reclassification from Accumulated OCI to income, estimated net amount to be transferred			$ (38,000,000)
Net Investment Hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount of hedged item | €		€ 700
Notional Amount		€ 500	$ 527,000,000