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Retirement Plan Benefits - Components of Change in Benefit Obligation of Pension Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation, at beginning of year	$ 495	$ 539
Interest cost	22us-gaap_DefinedBenefitPlanInterestCost	20us-gaap_DefinedBenefitPlanInterestCost
Benefits paid	(19)us-gaap_DefinedBenefitPlanBenefitsPaid	(18)us-gaap_DefinedBenefitPlanBenefitsPaid
Actuarial loss (gain)	56	(46)
Benefit obligation, at end of year	$ 554	$ 495

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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