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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]    
Net income $ 1,984 $ 1,345
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 2,365 1,865
Equity component of AFUDC (121) (209)
Severance expense 0 73
FERC mitigation costs 0 117
Community support and charitable contributions expense 34 100
(Gains) losses on sales of other assets 8 (21)
Impairment of other long-lived assets 388 588
Deferred income taxes 1,014 437
Equity in earnings of unconsolidated affiliates (91) (118)
Voluntary opportunity cost deferral 0 (101)
Accrued pension and other post-retirement benefit costs 259 152
Contributions to qualified pension plans (27) (79)
(Increase) decrease in [Abstract]    
Net realized and unrealized mark-to-market and hedging transactions (14) 68
Receivables (154) (83)
Inventory 119 (22)
Other current assets (48) 101
Increase (decrease) in [Abstract]    
Accounts payable (412) (222)
Taxes accrued 245 (7)
Other current liabilities (31) 128
Other assets (307) (167)
Other liabilities (221) 34
Net cash provided by (used in) operating activities 4,990 3,979
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]    
Capital expenditures (3,854) (3,845)
Investment expenditures (53) (7)
Acquisitions 0 (36)
Cash acquired from acquisition 0 71
Purchases of available-for-sale securities (4,591) (2,159)
Proceeds from sales and maturities of available-for-sale securities 4,687 1,947
Net proceeds from the sales of other assets, and sales of and collections on notes receivable 59 29
Change in restricted cash 166 (27)
Other 20 38
Net cash (used in) provided by investing activities (3,566) (3,989)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]    
Proceeds from the issuance of long-term debt 2,993 2,626
Proceeds from the issuance of common stock related to employee benefit plans 8 16
Payments for the redemption of long-term debt (2,506) (1,934)
Payments for the redemption of preferred stock (96) 0
Notes payable and commercial paper 537 98
Distributions to noncontrolling interests (9) (14)
Contributions from noncontrolling Interests 0 76
Dividends paid (1,636) (1,211)
Other 27 4
Net cash provided by (used in) financing activities (682) (339)
Net increase (decrease) in cash and cash equivalents 742 (349)
Cash and cash equivalents at beginning of period 1,424 2,110
Cash and cash equivalents at end of period 2,166 1,761
Merger with Progress Energy [Abstract]    
Fair value of assets acquired   48,698
Liabilities assumed   30,627
Issuance of common stock   18,071
Significant Non-cash Transactions [Abstract]    
Accrued capital expenditures 383 407
Extinguishment of debt related to investment in Attiki Gas Supply, S.A.   66
Duke Energy Carolinas [Member]
   
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]    
Net income 767 735
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 865 860
Equity component of AFUDC (70) (116)
FERC mitigation costs 0 46
Community support and charitable contributions expense 14 59
(Gains) losses on sales of other assets 0 (9)
Deferred income taxes 487 400
Voluntary opportunity cost deferral 0 (101)
Accrued pension and other post-retirement benefit costs 29 32
(Increase) decrease in [Abstract]    
Net realized and unrealized mark-to-market and hedging transactions (7) 0
Receivables (24) (28)
Receivables from affiliated companies (37) 0
Inventory 23 (62)
Other current assets 35 42
Increase (decrease) in [Abstract]    
Accounts payable (90) (152)
Accounts payable to affiliated companies 107 (9)
Taxes accrued 18 16
Other current liabilities 2 202
Other assets (80) (53)
Other liabilities (66) (99)
Net cash provided by (used in) operating activities 1,973 1,763
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]    
Capital expenditures (1,205) (1,453)
Purchases of available-for-sale securities (1,883) (672)
Proceeds from sales and maturities of available-for-sale securities 1,847 644
Notes receivable from affiliated companies (213) 112
Other (11) (6)
Net cash (used in) provided by investing activities (1,465) (1,375)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]    
Proceeds from the issuance of long-term debt 0 645
Payments for the redemption of long-term debt 0 (752)
Dividends to parent (500) (250)
Other (2) (6)
Net cash provided by (used in) financing activities (502) (363)
Net increase (decrease) in cash and cash equivalents 6 25
Cash and cash equivalents at beginning of period 19 289
Cash and cash equivalents at end of period 25 314
Significant Non-cash Transactions [Abstract]    
Accrued capital expenditures 111 126
Progress Energy [Member]
   
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]    
Net income 479 373
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 764 678
Equity component of AFUDC (39) (77)
Severance expense 0 39
FERC mitigation costs 0 71
Community support and charitable contributions expense 20 40
(Gains) losses on sales of other assets 3 (21)
Impairment of other long-lived assets 368 0
Deferred income taxes 384 257
Amounts to be refunded to customers 0 100
Accrued pension and other post-retirement benefit costs 158 137
Contributions to qualified pension plans (27) (122)
(Increase) decrease in [Abstract]    
Net realized and unrealized mark-to-market and hedging transactions 33 (12)
Receivables (219) (97)
Receivables from affiliated companies 12 (24)
Inventory 79 60
Other current assets (102) (6)
Increase (decrease) in [Abstract]    
Accounts payable (227) 6
Accounts payable to affiliated companies 25 29
Taxes accrued 161 175
Other current liabilities 113 (15)
Other assets (223) 0
Other liabilities (64) (141)
Net cash provided by (used in) operating activities 1,698 1,450
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]    
Capital expenditures (1,739) (1,695)
Purchases of available-for-sale securities (1,651) (947)
Proceeds from sales and maturities of available-for-sale securities 1,630 921
Change in restricted cash 0 24
Notes receivable from affiliated companies (103) 0
Other 12 88
Net cash (used in) provided by investing activities (1,851) (1,609)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]    
Proceeds from the issuance of long-term debt 545 1,432
Proceeds from the issuance of common stock related to employee benefit plans 0 6
Payments for the redemption of long-term debt (1,194) (961)
Payments for the redemption of preferred stock (96) 0
Payments of short-term debt with original maturities greater than 90 days 0 (65)
Proceeds from issuance of short-term debt with original maturities greater than 90 days 0 65
Notes payable and commercial paper 0 (671)
Notes payable to affiliated companies 740 635
Distributions to noncontrolling interests (2) (6)
Dividends paid 0 (445)
Other (5) (4)
Net cash provided by (used in) financing activities (12) (14)
Net increase (decrease) in cash and cash equivalents (165) (173)
Cash and cash equivalents at beginning of period 231 230
Cash and cash equivalents at end of period 66 57
Significant Non-cash Transactions [Abstract]    
Accrued capital expenditures 199 250
Asset retirement obligation additions and estimate revisions 0 813
Capital expenditures financed through capital leases 0 137
Duke Energy Progress [Member]
   
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]    
Net income 362 180
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 507 499
Equity component of AFUDC (33) (50)
Severance expense 0 16
FERC mitigation costs 0 71
Community support and charitable contributions expense 20 40
(Gains) losses on sales of other assets (1) (2)
Impairment of other long-lived assets 22 0
Deferred income taxes 272 127
Accrued pension and other post-retirement benefit costs 74 58
Contributions to qualified pension plans 0 (60)
(Increase) decrease in [Abstract]    
Net realized and unrealized mark-to-market and hedging transactions (11) (33)
Receivables (75) (35)
Receivables from affiliated companies 4 (10)
Inventory 32 23
Other current assets (41) (6)
Increase (decrease) in [Abstract]    
Accounts payable (168) (20)
Accounts payable to affiliated companies 0 23
Taxes accrued 63 62
Other current liabilities (75) 16
Other assets (87) (19)
Other liabilities (77) (27)
Net cash provided by (used in) operating activities 788 853
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]    
Capital expenditures (998) (1,098)
Purchases of available-for-sale securities (460) (385)
Proceeds from sales and maturities of available-for-sale securities 438 359
Other 3 75
Net cash (used in) provided by investing activities (1,017) (1,049)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]    
Proceeds from the issuance of long-term debt 545 988
Payments for the redemption of long-term debt (451) (502)
Payments for the redemption of preferred stock (62) 0
Notes payable and commercial paper 0 (188)
Notes payable to affiliated companies 217 212
Dividends to parent 0 (310)
Dividends paid on preferred stock 0 (2)
Other (6) (3)
Net cash provided by (used in) financing activities 243 195
Net increase (decrease) in cash and cash equivalents 14 (1)
Cash and cash equivalents at beginning of period 18 20
Cash and cash equivalents at end of period 32 19
Significant Non-cash Transactions [Abstract]    
Accrued capital expenditures 122 144
Asset retirement obligation additions and estimate revisions 0 684
Capital expenditures financed through capital leases 0 137
Duke Energy Florida [Member]
   
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]    
Net income 250 311
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 240 161
Equity component of AFUDC (6) (27)
Severance expense 0 7
(Gains) losses on sales of other assets (1) (2)
Impairment of other long-lived assets 346 0
Deferred income taxes 229 192
Amounts to be refunded to customers 0 100
Accrued pension and other post-retirement benefit costs 66 52
Contributions to qualified pension plans (27) (61)
(Increase) decrease in [Abstract]    
Net realized and unrealized mark-to-market and hedging transactions 37 64
Receivables (127) (76)
Receivables from affiliated companies 19 (12)
Inventory 46 36
Other current assets (132) (47)
Increase (decrease) in [Abstract]    
Accounts payable 30 68
Accounts payable to affiliated companies (19) 11
Taxes accrued 152 110
Other current liabilities 203 (15)
Other assets (128) 21
Other liabilities (44) (123)
Net cash provided by (used in) operating activities 1,134 770
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]    
Capital expenditures (734) (573)
Purchases of available-for-sale securities (1,191) (562)
Proceeds from sales and maturities of available-for-sale securities 1,192 561
Notes receivable from affiliated companies 177 0
Other 0 11
Net cash (used in) provided by investing activities (556) (563)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]    
Payments for the redemption of long-term debt (435) (9)
Payments for the redemption of preferred stock (34) 0
Payments of short-term debt with original maturities greater than 90 days 0 (65)
Proceeds from issuance of short-term debt with original maturities greater than 90 days 0 65
Notes payable and commercial paper 0 (233)
Notes payable to affiliated companies 0 213
Dividends to parent (225) (170)
Dividends paid on preferred stock 0 (1)
Other 0 (3)
Net cash provided by (used in) financing activities (694) (203)
Net increase (decrease) in cash and cash equivalents (116) 4
Cash and cash equivalents at beginning of period 131 16
Cash and cash equivalents at end of period 15 20
Significant Non-cash Transactions [Abstract]    
Accrued capital expenditures 76 102
Asset retirement obligation additions and estimate revisions 0 129
Duke Energy Ohio [Member]
   
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]    
Net income 96 133
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 268 252
(Gains) losses on sales of other assets (5) (2)
Deferred income taxes 76 78
Accrued pension and other post-retirement benefit costs 12 8
(Increase) decrease in [Abstract]    
Net realized and unrealized mark-to-market and hedging transactions 0 18
Receivables (6) 40
Receivables from affiliated companies 1 51
Inventory 29 21
Other current assets (8) 17
Increase (decrease) in [Abstract]    
Accounts payable (56) (56)
Accounts payable to affiliated companies 4 (16)
Taxes accrued (29) (49)
Other current liabilities 10 (16)
Other assets 3 (39)
Other liabilities (63) (73)
Net cash provided by (used in) operating activities 332 367
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]    
Capital expenditures (318) (386)
Net proceeds from the sales of other assets, and sales of and collections on notes receivable 11 82
Change in restricted cash 0 (46)
Notes receivable from affiliated companies (45) 317
Other 1 1
Net cash (used in) provided by investing activities (351) (32)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]    
Proceeds from the issuance of long-term debt 450 0
Payments for the redemption of long-term debt (257) (507)
Notes payable to affiliated companies (176) 86
Other (2) 0
Net cash provided by (used in) financing activities 15 (421)
Net increase (decrease) in cash and cash equivalents (4) (86)
Cash and cash equivalents at beginning of period 31 99
Cash and cash equivalents at end of period 27 13
Significant Non-cash Transactions [Abstract]    
Accrued capital expenditures 20 26
Transfer of Vermillion Generating Station   28
Duke Energy Indiana [Member]
   
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract]    
Net income 276 (109)
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract]    
Depreciation, amortization and accretion (including amortization of nuclear fuel) 230 296
Equity component of AFUDC (11) (61)
Impairment of other long-lived assets 0 580
Deferred income taxes 190 (97)
Accrued pension and other post-retirement benefit costs 19 12
(Increase) decrease in [Abstract]    
Net realized and unrealized mark-to-market and hedging transactions (31) 0
Receivables 15 16
Receivables from affiliated companies (19) 23
Inventory (33) (26)
Other current assets 27 5
Increase (decrease) in [Abstract]    
Accounts payable (22) 20
Accounts payable to affiliated companies (7) (20)
Taxes accrued 16 (35)
Other current liabilities (9) (7)
Other assets 2 15
Other liabilities (78) (28)
Net cash provided by (used in) operating activities 565 584
CASH FLOWS FROM INVESTING ACTIVITIES [Abstract]    
Capital expenditures (387) (582)
Purchases of available-for-sale securities (7) (12)
Proceeds from sales and maturities of available-for-sale securities 6 14
Notes receivable from affiliated companies (69) 0
Other (4) (1)
Net cash (used in) provided by investing activities (461) (581)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract]    
Proceeds from the issuance of long-term debt 498 250
Payments for the redemption of long-term debt (403) (4)
Notes payable to affiliated companies (81) (245)
Dividends to parent (125) 0
Other (4) (2)
Net cash provided by (used in) financing activities (115) (1)
Net increase (decrease) in cash and cash equivalents (11) 2
Cash and cash equivalents at beginning of period 36 16
Cash and cash equivalents at end of period 25 18
Significant Non-cash Transactions [Abstract]    
Accrued capital expenditures 36 37
Transfer of Vermillion Generating Station $ 0 $ 26