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Related Party Trasactions and Parent Company Investment - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Related Party Transaction [Line Items]        
Total allocated corporate expense $ 1,594,000,000 $ 1,961,000,000 $ 4,980,000,000 $ 5,514,000,000
Related party interest 10,000,000 14,000,000 30,000,000 50,000,000
7350 Services, Miscellaneous Equipment Rental and Leasing [Member]        
Related Party Transaction [Line Items]        
Leased equipment and services 4,000,000 15,000,000 $ 5,000,000 $ 18,000,000
Minimum [Member]        
Related Party Transaction [Line Items]        
Related party transaction rate     1.00% 1.00%
Maximum [Member]        
Related Party Transaction [Line Items]        
Related party transaction rate     8.00% 8.00%
Pro Forma        
Related Party Transaction [Line Items]        
Total allocated corporate expense $ 41,000,000 $ 40,000,000 $ 125,000,000 $ 127,000,000