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SCHEDULE I, CONDENSED FINANCIAL INFORMATION OF PARENT, FOOTNOTES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months [1] $ 897    
Long-term Debt, Maturities, Repayments of Principal in Year Two [1] 854    
Long-term Debt, Maturities, Repayments of Principal in Year Three [1] 1,369    
Long-term Debt, Maturities, Repayments of Principal in Year Four [1] 854    
Long-term Debt, Maturities, Repayments of Principal in Year Five [1] 968    
Long-term Debt, Maturities, Repayments of Principal after Year Five [1] 8,821    
Debt Instrument, Unamortized Discount 107 $ 102  
Long-term debt 13,134 12,086 [2]  
Current portion of long-term debt (907) (469) [2]  
Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 750    
Long-term Debt, Maturities, Repayments of Principal in Year Two 600    
Long-term Debt, Maturities, Repayments of Principal in Year Three 500    
Long-term Debt, Maturities, Repayments of Principal in Year Four 500    
Long-term Debt, Maturities, Repayments of Principal in Year Five 900    
Long-term Debt, Maturities, Repayments of Principal after Year Five 2,600    
Debt Instrument, Unamortized Discount (10) (9) [3]  
Long-term debt 5,195 4,644 [4]  
Current portion of long-term debt (752) 0 [4]  
Build to suit lease 136 75 [3]  
Rabbi trust investment gain (loss) 3 27 $ 39
Unamortized Debt Issuance Costs on Long-Term Debt (27) (22) [3]  
Other Long-term Debt, Due June 2018 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 500 500 [3]  
Debt Instrument, Interest Rate, Stated Percentage 6.15%    
Other Long-term Debt, Due February 2019 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 500 500 [3]  
Debt Instrument, Interest Rate, Stated Percentage 9.80%    
Other Long-term Debt, Due October 2039 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 750 750 [3]  
Debt Instrument, Interest Rate, Stated Percentage 6.00%    
Market Value Adjustment For Interest Rate Swap [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Market Value Adjustment For Interest Rate Swap $ (2) 0 [3]  
Other Long Term Debt, Variable Rate Notes Due June 2016 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 750 750 [3]  
Debt Instrument, Interest Rate, Stated Percentage 6.50%    
Debt Instrument, Interest Rate at Period End 4.77%    
Other Long Term Debt Due April 2017 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 600 600 [3]  
Debt Instrument, Interest Rate, Stated Percentage 2.30%    
Other Long Term Debt, Due October 2022 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 500 500 [3]  
Debt Instrument, Interest Rate, Stated Percentage 2.875%    
Other Long-term Debt, Due December 2023 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 500 500 [3]  
Debt Instrument, Interest Rate, Stated Percentage 4.05%    
Other Long-term Debt, Due June 2024 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 500 500 [3]  
Debt Instrument, Interest Rate, Stated Percentage 3.55%    
Other Long Term Debt Due March 2020 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 500 0 [3]  
Debt Instrument, Interest Rate, Stated Percentage 2.40%    
Other Long Term Debt Due November 2020 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 400 0 [3]  
Debt Instrument, Interest Rate, Stated Percentage 2.85%    
Other Long Term Debt Due November 2025 [Member] | Parent Company [Member]      
Condensed Financial Information of Parent, Long-term Debt [Line Items]      
Long-term Debt, Gross $ 350 $ 0 [3]  
Debt Instrument, Interest Rate, Stated Percentage 3.75%    
[1] Excludes capital lease obligations, build-to-suit lease and market value adjustments for interest rate swaps.
[2] As adjusted for the retrospective adoption of ASU 2015-03.
[3] (1) As adjusted for the retrospective adoption of ASU 2015-03.
[4] As adjusted for the retrospective adoption of ASU 2015-03.