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Pension Plans and Postretirement Benefits (Components of Benefits Expense)(Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Service cost | $ 139 | $ 99 | |
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Pension Benefits [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Expected return on plan assets | 5.00% | 5.00% | 6.50% |
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Pension Benefits [Member] | NBCUniversal Media, LLC [Member]
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| Defined Benefit Plan Disclosure [Line Items] | |||
| Service cost | 134 | 99 | |
| Expected return on plan assets | 5.00% | 5.00% | |