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Subsidiary Debt - Summary (Details) - USD ($)
$ in Millions
Feb. 28, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Par value   $ 36,295  
Other Long-term Debt, Noncurrent   26,748 $ 26,066
Subsidiary Debt [Member]      
Debt Instrument [Line Items]      
Par value   27,476  
Other Long-term Debt, Current   606 1,148
Other Long-term Debt, Noncurrent   26,748 26,066
Other long-term debt   27,354 27,214
Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   7,120  
Other long-term debt   7,079 7,159
Eligible Property Subject To Lien Of Mortgages   26,000  
Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   4,657  
Other long-term debt   4,592 4,560
Letters of credit supporting tax-exempt bond obligations [Member] | Letter of Credit [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Letters of Credit Outstanding, Amount   $ 255 $ 310
Maximum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate   0.22% 0.22%
Minimum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate   0.01% 0.02%
PacifiCorp [Member]      
Debt Instrument [Line Items]      
Letters of Credit Outstanding, Amount   $ 255 $ 310
Eligible Property Subject To Lien Of Mortgages   26,000  
PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   7,120  
Other long-term debt   7,079 7,159
PacifiCorp [Member] | Letters of credit supporting tax-exempt bond obligations [Member]      
Debt Instrument [Line Items]      
Letters of Credit Outstanding, Amount   255 310
MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   4,332  
Other long-term debt   4,301 $ 4,271
Eligible Property Subject To Lien Of Mortgages   $ 15,000  
First Mortgage Bonds, 3.85% To 8.53%, Due Through 2021 [Member] | Maximum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   8.53% 8.53%
First Mortgage Bonds, 3.85% To 8.53%, Due Through 2021 [Member] | Minimum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   3.85% 3.85%
First Mortgage Bonds, 3.85% To 8.53%, Due Through 2021 [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   $ 1,272  
First Mortgage Bonds, 3.85% To 8.53%, Due Through 2021 [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   1,272  
Other long-term debt   $ 1,269 $ 1,271
First Mortgage Bonds, 2.95% To 8.27%, Due 2022 To 2026 [Member] | Maximum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   8.27% 8.27%
First Mortgage Bonds, 2.95% To 8.27%, Due 2022 To 2026 [Member] | Minimum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   2.95% 2.95%
First Mortgage Bonds, 2.95% To 8.27%, Due 2022 To 2026 [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   $ 1,829  
First Mortgage Bonds, 2.95% To 8.27%, Due 2022 To 2026 [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   1,829  
Other long-term debt   $ 1,820 $ 1,819
First Mortgage Bonds, 7.70%, Due 2031 [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   7.70% 7.70%
First Mortgage Bonds, 7.70%, Due 2031 [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   $ 300  
First Mortgage Bonds, 7.70%, Due 2031 [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   300  
Other long-term debt   $ 298 $ 298
First Mortgage Bonds, 5.25% To 6.10%, Due 2034 to 2036 [Member] | Maximum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.10% 6.10%
First Mortgage Bonds, 5.25% To 6.10%, Due 2034 to 2036 [Member] | Minimum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   5.25% 5.25%
First Mortgage Bonds, 5.25% To 6.10%, Due 2034 to 2036 [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   $ 850  
First Mortgage Bonds, 5.25% To 6.10%, Due 2034 to 2036 [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   850  
Other long-term debt   $ 843 $ 843
First Mortgage Bonds, 5.75% To 6.35%, Due 2037 To 2039 [Member] | Maximum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   6.35% 6.35%
First Mortgage Bonds, 5.75% To 6.35%, Due 2037 To 2039 [Member] | Minimum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   5.75% 5.75%
First Mortgage Bonds, 5.75% To 6.35%, Due 2037 To 2039 [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   $ 2,150  
First Mortgage Bonds, 5.75% To 6.35%, Due 2037 To 2039 [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   2,150  
Other long-term debt   $ 2,134 $ 2,133
First Mortgage Bonds, 4.10%, Due 2042 [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   4.10% 4.10%
First Mortgage Bonds, 4.10%, Due 2042 [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   $ 300  
Debt Instrument, Interest Rate, Stated Percentage   4.10% 4.10%
First Mortgage Bonds, 4.10%, Due 2042 [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   $ 300  
Other long-term debt   297 $ 297
Tax-exempt bond obligations, variable rate series, due 2017 to 2018 [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   91  
Tax-exempt bond obligations, variable rate series, due 2017 to 2018 [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value [1]   91  
Other long-term debt [1]   91 91
Tax-exempt bond obligations, variable rate series, due 2018 to 2025 [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value [2]   108  
Tax-exempt bond obligations, variable rate series, due 2018 to 2025 [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value [1]   108  
Other long-term debt [1]   108 107
Variable-rate tax-exempt obligation series due 2024 [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value [2],[3]   143  
Variable-rate tax-exempt obligation series due 2024 [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value [1],[4]   143  
Other long-term debt [1],[4]   142 196
Variable-rate tax-exempt obligation series due 2024 to 2025 [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value [3]   50  
Variable-rate tax-exempt obligation series due 2024 to 2025 [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value [4]   50  
Other long-term debt [4]   $ 50 59
Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member] | Maximum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   14.61%  
Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member] | Minimum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   8.75%  
Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member] | PacifiCorp [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Par value   $ 27  
Other long-term debt   $ 27 $ 45
Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member] | PacifiCorp [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   14.61% 14.61%
Capital Lease Obligations, 8.75% To 14.61%, Due Through 2035 [Member] | PacifiCorp [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage   8.75% 8.75%
Capital lease obligations, 8.75% to 15.678%, due through 2035 [Member] | Maximum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage     15.678%
Capital lease obligations, 8.75% to 15.678%, due through 2035 [Member] | Minimum [Member] | Subsidiary Debt [Member] | PacifiCorp [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage     8.75%
Senior Notes, 6.927%, due 2029 [Member] | MidAmerican Funding LLC [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 325  
Other long-term debt   $ 291 $ 289
Debt Instrument, Interest Rate, Stated Percentage   6.927% 6.927%
Tax-exempt bond obligations, variable rate, due 2016-2046 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate   0.76%  
Par value   $ 220  
Other long-term debt   219 $ 194
Tax-exempt bond obligations, variable rate, due 2016-2038 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     0.03%
MEC First Mortgage Bonds, 2.40%, Due March 2019 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   500  
Other long-term debt   $ 499 $ 499
Debt Instrument, Interest Rate, Stated Percentage   2.40% 2.40%
MEC First Mortgage Bonds, 3.70%, Due September 2023 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 250  
Other long-term debt   $ 248 $ 248
Debt Instrument, Interest Rate, Stated Percentage   3.70% 3.70%
MEC First Mortgage Bonds, 3.50%, Due October 2024 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 500  
Other long-term debt   $ 501 $ 502
Debt Instrument, Interest Rate, Stated Percentage   3.50% 3.50%
MEC First Mortgage Bonds, 4.80%, Due September 2043 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 350  
Other long-term debt   $ 345 $ 345
Debt Instrument, Interest Rate, Stated Percentage   4.80% 4.80%
MEC First Mortgage Bonds, 4.40%, Due October 2044 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 400  
Other long-term debt   $ 394 $ 394
Debt Instrument, Interest Rate, Stated Percentage   4.40% 4.40%
MEC First Mortgage Bonds, 4.25%, Due May 2046 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 450  
Other long-term debt   $ 445 $ 444
Debt Instrument, Interest Rate, Stated Percentage   4.25% 0.00%
MEC Notes, 5.95% Series, due 2017 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 250  
Other long-term debt   $ 250 $ 250
Debt Instrument, Interest Rate, Stated Percentage   5.95% 5.95%
MEC Notes, 5.3% Series, due 2018 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 350  
Other long-term debt   $ 350 $ 349
Debt Instrument, Interest Rate, Stated Percentage   5.30% 5.30%
MEC Notes, 6.75% Series, due 2031 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 400  
Other long-term debt   $ 396 $ 395
Debt Instrument, Interest Rate, Stated Percentage   6.75% 6.75%
MEC Notes, 5.75% Series, due 2035 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 300  
Other long-term debt   $ 298 $ 298
Debt Instrument, Interest Rate, Stated Percentage   5.75% 5.75%
MEC Notes, 5.8% Series, due 2036 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 350  
Other long-term debt   $ 347 $ 347
Debt Instrument, Interest Rate, Stated Percentage   5.80% 5.80%
MEC Transmission Upgrade Obligations, 4.45% and 3.42% Due Through 2035 and 2036 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   $ 10  
Other long-term debt   7 $ 4
Capital Lease Obligations, 4.16%, Due Through 2020 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value   2  
Other long-term debt   $ 2 $ 2
Subsequent Event [Member] | MEC First Mortgage Bonds, 3.10%, Due May 2027 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value $ 375    
Debt Instrument, Interest Rate, Stated Percentage 3.10%    
Subsequent Event [Member] | MEC Notes, 5.95% Series, due 2017 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.95%    
Debt Instrument, Repurchased Face Amount $ 250    
Subsequent Event [Member] | MEC First Mortgage Bonds, 3.95%, Due 2047 [Member] | MidAmerican Energy Company [Member] | Subsidiary Debt [Member] | MidAmerican Funding [Member]      
Debt Instrument [Line Items]      
Par value $ 475    
Debt Instrument, Interest Rate, Stated Percentage 3.95%    
[1] Supported by $255 million and $310 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2016 and 2015, respectively.
[2] 1)Supported by $255 million and $310 million of fully available letters of credit issued under committed bank arrangements as of December 31, 2016 and 2015, respectively.
[3] 2)Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations.
[4] Secured by pledged first mortgage bonds registered to and held by the tax-exempt bond trustee generally with the same interest rates, maturity dates and redemption provisions as the tax-exempt bond obligations.