Consolidated Statements of Comprehensive Income Consolidated Statement of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	$ 429	$ 405
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax	86	108
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	44	(50)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	(73)	31
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent	57	89
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 486	$ 494