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Long-term Debt Long-term Debt - Swaps/Maturities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2016
[1]
Jun. 30, 2016
[2]
Dec. 31, 2015
Debt Instrument [Line Items]      
2016     $ 264
Debt Instrument, Description of Variable Rate Basis     3 month LIBOR
2017     $ 277
2018     286
2019     951
2020     634
Thereafter     3,280
Long-term Debt, Gross     5,692
Interest Rate Swap [Member]      
Debt Instrument [Line Items]      
Derivative, Notional Amount     $ 1,991
Interest Rate Swap [Member] | NRG Solar Alpine LLC [Member] | Maturity - December 31, 2029 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     85.00%
Derivative, Fixed Interest Rate     2.744%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 122
Interest Rate Swap [Member] | NRG Solar Alpine LLC [Member] | Maturity - June 30, 2025 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     85.00%
Derivative, Fixed Interest Rate     2.421%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 9
Interest Rate Swap [Member] | NRG Solar Avra Valley [Member] | Maturity - November 30, 2030 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     85.00%
Derivative, Fixed Interest Rate     2.333%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 51
Interest Rate Swap [Member] | NRG Solar Blythe LLC [Member] | Maturity - June 25, 2028 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     75.00%
Derivative, Fixed Interest Rate     3.563%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 16
Interest Rate Swap [Member] | Borrego [Member] | Maturity - December 31, 2029 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     75.00%
Derivative, Fixed Interest Rate     1.125%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 9
Interest Rate Swap [Member] | NRG West Holdings LLC [Member] | Maturity - June 30, 2023 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     75.00%
Derivative, Fixed Interest Rate     2.417%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 358
Interest Rate Swap [Member] | Kansas South [Member] | Maturity - June 30, 2023 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     75.00%
Derivative, Fixed Interest Rate     2.368%
Debt Instrument, Description of Variable Rate Basis     6-Month LIBOR
Derivative, Notional Amount     $ 25
Interest Rate Swap [Member] | Laredo Ridge [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     75.00%
Derivative, Fixed Interest Rate     2.31%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 83
Interest Rate Swap [Member] | Marsh Landing [Member] | Maturity - June 30, 2023 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     75.00%
Derivative, Fixed Interest Rate     3.244%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 387
Interest Rate Swap [Member] | NRG Solar Roadrunner LLC [Member] | Maturity - December 31, 2029 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     75.00%
Derivative, Fixed Interest Rate     4.313%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 30
Interest Rate Swap [Member] | South Trent Wind LLC [Member] | Maturity - June14, 2020 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     75.00%
Derivative, Fixed Interest Rate     3.265%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 46
Interest Rate Swap [Member] | South Trent Wind LLC [Member] | Maturity - June 14, 2028 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     75.00%
Derivative, Fixed Interest Rate     4.95%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 21
Interest Rate Swap [Member] | Tapestry Wind [Member] | Maturity - December 21, 2021 [Member] [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     75.00%
Derivative, Fixed Interest Rate     2.21%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 163
Interest Rate Swap [Member] | Tapestry Wind [Member] | Maturity - December 21, 2029 [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     50.00%
Derivative, Fixed Interest Rate     3.57%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 60
Alta Wind Asset Management, due 2031 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Description of Variable Rate Basis 3 month LIBOR 3 month LIBOR 3 month LIBOR
Alta Wind Asset Management, due 2031 [Member] | Interest Rate Swap [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     100.00%
Derivative, Fixed Interest Rate     2.47%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 19
Viento Funding II, Inc., due in 2023 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Description of Variable Rate Basis 3-Month LIBOR 3-Month LIBOR 3-Month LIBOR
Viento Funding II, Inc., due in 2023 [Member] | Interest Rate Swap [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     90.00%
Debt Instrument, Description of Variable Rate Basis     6-Month LIBOR
Derivative, Notional Amount     $ 235
Walnut Creek [Member] | Interest Rate Swap [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     75.00%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 311
WCEP Holdings, LLC, due in 2023 [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Description of Variable Rate Basis 3-Month LIBOR 3-Month LIBOR 3-Month LIBOR
WCEP Holdings, LLC, due in 2023 [Member] | Interest Rate Swap [Member]      
Debt Instrument [Line Items]      
Percentage of Debt Hedged by Interest Rate Derivatives     90.00%
Derivative, Fixed Interest Rate     4.003%
Debt Instrument, Description of Variable Rate Basis     3-Month LIBOR
Derivative, Notional Amount     $ 46
[1] As of March 31, 2016, L+ equals 3 month LIBOR plus x%, except for the NRG Marsh Landing term loan, Walnut Creek term loan, and NRG Yield LLC and Yield Operating LLC Revolving Credit Facility, where L+ equals 1 month LIBOR plus x% and Kansas South, where L+ equals 6 month LIBOR plus x%
[2] As of June 30, 2016, L+ equals 3 month LIBOR plus x%, except for the Marsh Landing term loan, Walnut Creek term loan, and NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, where L+ equals 1 month LIBOR plus x% and Kansas South, where L+ equals 6 month LIBOR plus x%