Debt (Schedule of Pre-tax Loss on Extinguishment of Debt) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Debt Disclosure [Abstract]
Premiums and fees	$ 809	$ 0	$ 809	$ 226
Write-off of unamortized debt discounts and debt issuance costs	14	0	14	2
Total	$ 823	$ 0	$ 823	$ 228