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Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2016 | Sep. 30, 2016 | Sep. 30, 2015
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ (11) | $ (42) |  | $ (55) | $ (46)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 4 | 18 |  | 24 | 19
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (7) | (24) |  | (31) | (27)
Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Energy-Related Contracts, Pre-Tax | 0 | 0 | $ 0 |  | 17
Energy-Related Contracts, Tax |  | 0 |  |  | (7)
Energy-Related Contracts, After-Tax |  | 0 |  |  | 10
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 | $ 0 | 0 | 10
Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (14) | (14) |  | (42) | (42)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 5 | 5 |  | 17 | 17
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (9) | (9) |  | (25) | (25)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (9) | (9) |  | (25) | (25)
Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 3 | (28) |  | (13) | (21)
Reclassification for Available for Sale Securities, Tax | (1) | 13 |  | 7 | 9
Reclassification for Available for Sale Securities, After-Tax | 2 | (15) |  | (6) | (12)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 2 | (15) |  | (6) | (12)
Power [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (9) | (39) |  | (50) | (41)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 4 | 18 |  | 22 | 18
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (5) | (21) |  | (28) | (23)
Power [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Energy-Related Contracts, Pre-Tax |  | 0 |  |  | 17
Energy-Related Contracts, Tax |  | 0 |  |  | (7)
Energy-Related Contracts, After-Tax |  | 0 |  |  | 10
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 0 | 0 |  | 0 | 10
Power [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (12) | (12) |  | (36) | (36)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 5 | 5 |  | 15 | 15
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (7) | (7) |  | (21) | (21)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | (7) | (7) |  | (21) | (21)
Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 3 | (27) |  | (14) | (22)
Reclassification for Available for Sale Securities, Tax | (1) | 13 |  | 7 | 10
Reclassification for Available for Sale Securities, After-Tax | 2 | (14) |  | (7) | (12)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 2 | (14) |  | (7) | (12)
Operating Expense [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 3 | 3 |  | 9 | 9
Amortization of Prior Service (Cost) Credit, Tax | (2) | (1) |  | (4) | (3)
Amortization of Prior Service (Cost) Credit, After-Tax | 1 | 2 |  | 5 | 6
Amortization of Actuarial Loss, Pre-Tax | (17) | (17) |  | (51) | (51)
Amortization of Actuarial Loss, Tax | 7 | 6 |  | 21 | 20
Amortization of Actuarial Loss, After-Tax | (10) | (11) |  | (30) | (31)
Operating Expense [Member] | Power [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 3 | 3 |  | 8 | 9
Amortization of Prior Service (Cost) Credit, Tax | (1) | (1) |  | (3) | (3)
Amortization of Prior Service (Cost) Credit, After-Tax | 2 | 2 |  | 5 | 6
Amortization of Actuarial Loss, Pre-Tax | (15) | (15) |  | (44) | (45)
Amortization of Actuarial Loss, Tax | 6 | 6 |  | 18 | 18
Amortization of Actuarial Loss, After-Tax | (9) | (9) |  | (26) | (27)
Operating Revenues [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Energy-Related Contracts, Pre-Tax |  | 0 |  |  | 17
Energy-Related Contracts, Tax |  | 0 |  |  | (7)
Energy-Related Contracts, After-Tax |  | 0 |  |  | 10
Operating Revenues [Member] | Power [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Energy-Related Contracts, Pre-Tax |  | 0 |  |  | 17
Energy-Related Contracts, Tax |  | 0 |  |  | (7)
Energy-Related Contracts, After-Tax |  | 0 |  |  | 10
Other Income [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 13 | 14 |  | 41 | 49
Reclassification for Available for Sale Securities, Tax | (6) | (7) |  | (20) | (25)
Reclassification for Available for Sale Securities, After-Tax | 7 | 7 |  | 21 | 24
Other Income [Member] | Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | 12 | 14 |  | 37 | 47
Reclassification for Available for Sale Securities, Tax | (5) | (7) |  | (18) | (24)
Reclassification for Available for Sale Securities, After-Tax | 7 | 7 |  | 19 | 23
Other Expense [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (5) | (12) |  | (29) | (25)
Reclassification for Available for Sale Securities, Tax | 3 | 5 |  | 15 | 12
Reclassification for Available for Sale Securities, After-Tax | (2) | (7) |  | (14) | (13)
Other Expense [Member] | Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (4) | (11) |  | (26) | (24)
Reclassification for Available for Sale Securities, Tax | 2 | 5 |  | 13 | 12
Reclassification for Available for Sale Securities, After-Tax | (2) | (6) |  | (13) | (12)
Other-Than-Temporary Impairments [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (5) | (30) |  | (25) | (45)
Reclassification for Available for Sale Securities, Tax | 2 | 15 |  | 12 | 22
Reclassification for Available for Sale Securities, After-Tax | (3) | (15) |  | (13) | (23)
Other-Than-Temporary Impairments [Member] | Power [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (5) | (30) |  | (25) | (45)
Reclassification for Available for Sale Securities, Tax | 2 | 15 |  | 12 | 22
Reclassification for Available for Sale Securities, After-Tax | $ (3) | $ (15) |  | $ (13) | $ (23)

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- Definition Amount before tax of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) related to pension and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 + Details
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