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Statements of Cash Flows (Unaudited) - MEC - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income (loss) $ 2,285 $ 1,786
Adjustments to reconcile net income to net cash flows from operating activities:    
Allowance for equity funds (56) (72)
Deferred income taxes and amortization of investment tax credits 613 288
Other, net (26) 18
Changes in other operating assets and liabilities, net of effects from acquisitions:    
Trade receivables and other assets (254) (783)
Pension and other postretirement benefit plans (33) (45)
Accrued property, income and other taxes, net 76 (605)
Accounts payable and other liabilities 187 240
Net cash flows from operating activities 4,232 1,854
Cash flows from investing activities:    
Capital expenditures (2,848) (2,793)
Purchases of marketable securities (185) (272)
Proceeds from sales of marketable securities 163 256
Other, net (53) 58
Net cash flows from investing activities (2,975) (3,838)
Cash flows from financing activities:    
Net proceeds from (repayments of) short-term debt 245 (920)
Other, net (28) (39)
Net cash flows from financing activities (1,204) 2,798
Net change in cash and cash equivalents and restricted cash and cash equivalents 55 802
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period 1,445 1,268
Cash and cash equivalents and restricted cash and cash equivalents at end of period 1,500 2,070
MEC    
Cash flows from operating activities:    
Net income (loss) 360 360
Adjustments to reconcile net income to net cash flows from operating activities:    
Depreciation and amortization 416 351
Amortization of utility plant to other operating expenses 17 17
Allowance for equity funds (14) (17)
Deferred income taxes and amortization of investment tax credits 196 131
Settlements of asset retirement obligations (19) (25)
Other, net 11 8
Changes in other operating assets and liabilities, net of effects from acquisitions:    
Trade receivables and other assets (275) (1)
Inventories 41 (31)
Pension and other postretirement benefit plans 0 (11)
Accrued property, income and other taxes, net 56 (409)
Accounts payable and other liabilities (68) (47)
Net cash flows from operating activities 721 326
Cash flows from investing activities:    
Capital expenditures (720) (824)
Purchases of marketable securities (109) (210)
Proceeds from sales of marketable securities 105 202
Other, net (2) 14
Net cash flows from investing activities (726) (818)
Cash flows from financing activities:    
Net proceeds from (repayments of) short-term debt 0 195
Other, net (2) (1)
Net cash flows from financing activities (2) 194
Net change in cash and cash equivalents and restricted cash and cash equivalents (7) (298)
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period 45 330
Cash and cash equivalents and restricted cash and cash equivalents at end of period $ 38 $ 32