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Guarantor Financial Information (CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS) (Details) - USD ($)
$ in Millions
6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities    
Net Cash Provided by Operating Activities $ 3,239 $ 2,250
Cash flows from investing activities    
Capital expenditures - network and other (1,803) (943)
Capital expenditures - leased devices (1,105) (763)
Expenditures relating to FCC licenses (19) (32)
Proceeds from sales and maturities of short-term investments 5,582 1,122
Payments to Acquire Short-term Investments (1,748) (2,772)
Increase (decrease) due from consolidated affiliate from investing activities 0 0
Proceeds from sales of assets and FCC Licenses 218 66
Payments for Advance to Affiliate   0
Proceeds from Related Party Debt   0
Payments for (Proceeds from) Other Investing Activities (1) (36)
Net Cash Used in Investing Activities 1,124 (3,358)
Cash flows from financing activities    
Proceeds from debt and financings 1,860 3,278
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities (4,261) (667)
Debt financing costs 9 175
Intercompany dividends paid to parent   0
Increase (decrease) due from/to consolidated affiliates from financing activities 0 0
Intercompany note advance from parent   0
Other, net (21) 37
Net cash provided by (used in) financing activities (2,431) 2,473
Cash and Cash Equivalents, Period Increase (Decrease) 1,932 1,365
Cash and cash equivalents, beginning of period 2,870 2,641
Cash and cash equivalents, end of period 4,802 4,006
Repayments of Related Party Debt   0
Parent Company [Member]    
Cash flows from operating activities    
Net Cash Provided by Operating Activities 0 0
Cash flows from investing activities    
Capital expenditures - network and other 0 0
Capital expenditures - leased devices 0 0
Expenditures relating to FCC licenses 0 0
Proceeds from sales and maturities of short-term investments 0 0
Payments to Acquire Short-term Investments 0 0
Increase (decrease) due from consolidated affiliate from investing activities 0 0
Proceeds from sales of assets and FCC Licenses 0 0
Payments for Advance to Affiliate   0
Proceeds from Related Party Debt   0
Payments for (Proceeds from) Other Investing Activities 0 0
Net Cash Used in Investing Activities 0 0
Cash flows from financing activities    
Proceeds from debt and financings 0 0
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities 0 0
Debt financing costs 0 0
Intercompany dividends paid to parent   0
Increase (decrease) due from/to consolidated affiliates from financing activities 0 0
Intercompany note advance from parent   0
Other, net 0 0
Net cash provided by (used in) financing activities 0 0
Cash and Cash Equivalents, Period Increase (Decrease) 0 0
Cash and cash equivalents, beginning of period 0 0
Cash and cash equivalents, end of period 0  
Repayments of Related Party Debt   0
Guarantor Subsidiaries [Member]    
Cash flows from operating activities    
Net Cash Provided by Operating Activities (1,076) (780)
Cash flows from investing activities    
Capital expenditures - network and other 0 0
Capital expenditures - leased devices 0 0
Expenditures relating to FCC licenses 0 0
Proceeds from sales and maturities of short-term investments 5,582 1,087
Payments to Acquire Short-term Investments (1,748) (2,737)
Increase (decrease) due from consolidated affiliate from investing activities 1,628 3,883
Proceeds from sales of assets and FCC Licenses 0 0
Payments for Advance to Affiliate   (70)
Proceeds from Related Party Debt   62
Payments for (Proceeds from) Other Investing Activities 0 0
Net Cash Used in Investing Activities 5,462 2,225
Cash flows from financing activities    
Proceeds from debt and financings 0 0
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities (2,520) 0
Debt financing costs 9 110
Intercompany dividends paid to parent   0
Increase (decrease) due from/to consolidated affiliates from financing activities 0 0
Intercompany note advance from parent   0
Other, net 1 20
Net cash provided by (used in) financing activities (2,528) (90)
Cash and Cash Equivalents, Period Increase (Decrease) 1,858 1,355
Cash and cash equivalents, beginning of period 2,461 2,154
Cash and cash equivalents, end of period 4,319  
Repayments of Related Party Debt   0
Non-Guarantor Subsidiaries [Member]    
Cash flows from operating activities    
Net Cash Provided by Operating Activities 4,315 3,148
Cash flows from investing activities    
Capital expenditures - network and other (1,803) (943)
Capital expenditures - leased devices (1,105) (763)
Expenditures relating to FCC licenses (19) (32)
Proceeds from sales and maturities of short-term investments 0 35
Payments to Acquire Short-term Investments 0 (35)
Increase (decrease) due from consolidated affiliate from investing activities 0 0
Proceeds from sales of assets and FCC Licenses 218 66
Payments for Advance to Affiliate   0
Proceeds from Related Party Debt   0
Payments for (Proceeds from) Other Investing Activities (1) (36)
Net Cash Used in Investing Activities (2,710) (1,708)
Cash flows from financing activities    
Proceeds from debt and financings 1,860 3,278
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities (1,741) (667)
Debt financing costs 0 65
Intercompany dividends paid to parent   (118)
Increase (decrease) due from/to consolidated affiliates from financing activities (1,628) (3,883)
Intercompany note advance from parent   70
Other, net (22) 17
Net cash provided by (used in) financing activities (1,531) (1,430)
Cash and Cash Equivalents, Period Increase (Decrease) 74 10
Cash and cash equivalents, beginning of period 409 487
Cash and cash equivalents, end of period 483  
Repayments of Related Party Debt   (62)
Consolidation, Eliminations [Member]    
Cash flows from operating activities    
Net Cash Provided by Operating Activities 0 (118)
Cash flows from investing activities    
Capital expenditures - network and other 0 0
Capital expenditures - leased devices 0 0
Expenditures relating to FCC licenses 0 0
Proceeds from sales and maturities of short-term investments 0 0
Payments to Acquire Short-term Investments 0 0
Increase (decrease) due from consolidated affiliate from investing activities (1,628) (3,883)
Proceeds from sales of assets and FCC Licenses 0 0
Payments for Advance to Affiliate   70
Proceeds from Related Party Debt   (62)
Payments for (Proceeds from) Other Investing Activities 0 0
Net Cash Used in Investing Activities (1,628) (3,875)
Cash flows from financing activities    
Proceeds from debt and financings 0 0
Repayments of Long-term Debt, Long-term Capital Lease Obligations, and Capital Securities 0 0
Debt financing costs 0 0
Intercompany dividends paid to parent   118
Increase (decrease) due from/to consolidated affiliates from financing activities 1,628 3,883
Intercompany note advance from parent   (70)
Other, net 0 0
Net cash provided by (used in) financing activities 1,628 3,993
Cash and Cash Equivalents, Period Increase (Decrease) 0 0
Cash and cash equivalents, beginning of period 0 0
Cash and cash equivalents, end of period $ 0  
Repayments of Related Party Debt   $ 62