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Retirement Plan Benefits - Reconciliation of Beginning and Ending Balances of Fair Value of Assets of Pension Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]    
Fair value of plan assets, at beginning of year $ 431 $ 397
Actual return on plan assets 35 51
Defined Benefit Plan, Contributions by Employer 1 0
Benefits paid (18) (17)
Fair value of plan assets, at end of year $ 449 $ 431