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Basis of Presentation and Summary of Significant Accounting Policies Basis of Presentation and Summary of Significant Accounting Policies (Details 5) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income | $ 321,000,000 | $ 268,000,000 | $ 238,000,000 | $ 247,000,000 | $ 216,000,000 | $ 245,000,000 | $ 256,000,000 | $ 253,000,000 | $ 1,074,000,000 | $ 970,000,000 | $ 964,000,000
Total current assets | 1,602,000,000 |  |  |  | 1,683,000,000 |  |  |  | 1,602,000,000 | 1,683,000,000 |
Other assets, net | 92,000,000 |  |  |  | 100,000,000 |  |  |  | 92,000,000 | 100,000,000 |
Long-term debt, excluding current maturities | 6,997,000,000 |  |  |  | 7,152,000,000 |  |  |  | 6,997,000,000 | 7,152,000,000 |
Deferred income taxes, net | $ 1,896,000,000 |  |  |  | 2,085,000,000 |  |  |  | $ 1,896,000,000 | 2,085,000,000 |
Restatement adjustment | New accounting pronouncement, early adoption, effect |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  |  | 0 | 0
Total current assets |  |  |  |  | (163,000,000) |  |  |  |  | (163,000,000) |
Other assets, net |  |  |  |  | (109,000,000) |  |  |  |  | (109,000,000) |
Long-term debt, excluding current maturities |  |  |  |  | (110,000,000) |  |  |  |  | (110,000,000) |
Deferred income taxes, net |  |  |  |  | $ (162,000,000) |  |  |  |  | (162,000,000) |
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  |  | $ 0 | $ 0

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