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Debt and Other Obligations (Indebtedness) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Credit Facility Amendment, Date |  |  | Jun. 01, 2018 |  |
Debt and Capital Lease Obligations |  |  | $ 15,956 |  | $ 16,159
Less: current maturities and short-term debt and other current obligations |  |  | 112 |  | 115
Non-current portion of long-term debt and other long-term obligations |  |  | $ 15,844 |  | 16,044
3.150% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 750 |  |  |
Debt Instrument, Maturity Date |  | Jul. 01, 2023 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.20% |  |  |
3.800% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Face Amount |  | $ 1,000 |  |  |
Debt Instrument, Maturity Date |  | Feb. 01, 2028 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.80% |  |  |
Variable Rate Revolver 2016 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument, Maturity Date |  |  | Jun. 01, 2023 |  |
Line of Credit Facility, Change in Borrowing Capacity |  |  | $ 750 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 4,250 |  |
Debt Instrument, Unused Borrowing Capacity, Amount |  |  | $ 3,900 |  |
Capital Lease Obligations and Other [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Contractual maturity date | [1] |  | Various |  |
Original Debt Issuance Date |  |  | Various |  |
Percentage of debt instrument interest rate stated | [1] |  | Various |  |
Debt and Capital Lease Obligations |  |  | $ 222 |  | 227
Fixed Rate Securitized Debt 2010 Tower Revenue Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Instrument Additional Interest Rate if not Repaid Prior to Applicable Date |  |  | 5.00% |  |
January 2018 Senior Note [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Jan. 01, 2018 |  |
Bank Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt and Capital Lease Obligations |  |  | $ 2,698 |  | 3,377
Bank Debt [Member] | Variable Rate Revolver 2016 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Jan. 01, 2016 |  |
Debt Instrument, Maturity Date | [2],[3] |  | Jun. 01, 2023 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 3.40% |  |
Debt and Capital Lease Obligations |  |  | $ 315 | [3],[4],[5] | 980
Bank Debt [Member] | Variable Rate 2016 Term Loan A [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Jan. 01, 2016 |  |
Debt Instrument, Maturity Date | [2],[3] |  | Jun. 01, 2023 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 3.30% |  |
Debt and Capital Lease Obligations |  |  | $ 2,383 |  | 2,397
Securitized Debt [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt and Capital Lease Obligations |  |  | $ 2,079 |  | 3,332
Securitized Debt [Member] | Fixed Rate Debt 2009 Securitized Notes First Tranche [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Jul. 01, 2009 |  |
Debt Instrument, Maturity Date | [1] |  | Aug. 01, 2019 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 6.30% |  |
Debt and Capital Lease Obligations |  |  | $ 22 |  | 32
Securitized Debt [Member] | Fixed Rate Securitized Debt January 2010 Tower Revenue Notes Third Tranche [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Jan. 01, 2010 |  |
Debt Instrument, Maturity Date | [1],[6] |  | Jan. 01, 2040 |  |
Debt and Capital Lease Obligations |  |  | $ 0 | [5] | 1,246
Securitized Debt [Member] | Fixed Rate Securitized Debt August 2010 Tower Revenue Notes Third Tranche [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Aug. 01, 2010 |  |
Debt Instrument, Maturity Date | [1],[6],[7] |  | Aug. 01, 2040 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 4.88% |  |
Debt and Capital Lease Obligations |  |  | $ 996 |  | 995
Securitized Debt [Member] | Fixed Rate Debt 2009 Securitized Notes Second Tranche [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Jul. 01, 2009 |  |
Debt Instrument, Maturity Date | [1] |  | Aug. 01, 2029 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 9.00% |  |
Debt and Capital Lease Obligations |  |  | $ 70 |  | 70
Securitized Debt [Member] | 2015 Tower Revenue Notes 3.222% due 2042 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | May 01, 2015 |  |
Debt Instrument, Maturity Date | [1],[6] |  | May 01, 2042 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 3.22% |  |
Debt and Capital Lease Obligations |  |  | $ 298 |  | 297
Securitized Debt [Member] | 2015 Tower Revenue Notes 3.663% due 2045 [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | May 01, 2015 |  |
Debt Instrument, Maturity Date | [1],[6] |  | May 01, 2045 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 3.66% |  |
Debt and Capital Lease Obligations |  |  | $ 693 |  | 692
High Yield Bonds [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt and Capital Lease Obligations |  |  | $ 10,957 |  | 9,223
High Yield Bonds [Member] | September 2016 Senior Unsecured Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Sep. 01, 2016 |  |
Debt Instrument, Maturity Date | [1] |  | Sep. 01, 2021 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 2.30% |  |
Debt and Capital Lease Obligations |  |  | $ 696 |  | 695
High Yield Bonds [Member] | February 2017 Senior Unsecured Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Feb. 01, 2017 |  |
Debt Instrument, Maturity Date | [1] |  | Mar. 01, 2027 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 4.00% |  |
Debt and Capital Lease Obligations |  |  | $ 494 |  | 494
High Yield Bonds [Member] | May 2017 Senior Unsecured Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | May 01, 2017 |  |
Debt Instrument, Maturity Date | [1] |  | May 01, 2047 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 4.80% |  |
Debt and Capital Lease Obligations |  |  | $ 343 |  | 343
High Yield Bonds [Member] | August 2017 Senior Unsecured 3.200% Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Aug. 01, 2017 |  |
Debt Instrument, Maturity Date | [1] |  | Sep. 01, 2024 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 3.20% |  |
Debt and Capital Lease Obligations |  |  | $ 742 |  | 742
High Yield Bonds [Member] | August 2017 Senior Unsecured 3.650% Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Aug. 01, 2017 |  |
Debt Instrument, Maturity Date | [1] |  | Sep. 01, 2027 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 3.70% |  |
Debt and Capital Lease Obligations |  |  | $ 991 |  | 991
High Yield Bonds [Member] | 3.150% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Jan. 01, 2018 |  |
Debt Instrument, Maturity Date | [1] |  | Jul. 01, 2023 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 3.20% |  |
Debt and Capital Lease Obligations |  |  | $ 742 | [5] | 0
High Yield Bonds [Member] | 3.800% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Jan. 01, 2018 |  |
Debt Instrument, Maturity Date | [1] |  | Feb. 01, 2028 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 3.80% |  |
Debt and Capital Lease Obligations |  |  | $ 988 | [5] | 0
High Yield Bonds [Member] | Five and One Fourth Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Oct. 01, 2012 |  |
Debt Instrument, Maturity Date | [1] |  | Jan. 15, 2023 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 5.30% |  |
Debt and Capital Lease Obligations |  |  | $ 1,640 |  | 1,639
High Yield Bonds [Member] | 2012 secured notes tranche B [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Dec. 01, 2012 |  |
Debt Instrument, Maturity Date | [1] |  | Apr. 15, 2023 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 3.90% |  |
Debt and Capital Lease Obligations |  |  | $ 993 |  | 993
High Yield Bonds [Member] | 4.875% Senior Notes [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Apr. 01, 2014 |  |
Debt Instrument, Maturity Date | [1] |  | Apr. 01, 2022 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 4.90% |  |
Debt and Capital Lease Obligations |  |  | $ 843 |  | 842
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 3.40% [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Feb. 01, 2016 |  |
Debt Instrument, Maturity Date | [1] |  | Feb. 15, 2021 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 3.40% |  |
Debt and Capital Lease Obligations |  |  | $ 850 |  | 850
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 3.7% [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | May 01, 2016 |  |
Debt Instrument, Maturity Date | [1] |  | Jun. 15, 2026 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 3.70% |  |
Debt and Capital Lease Obligations |  |  | $ 743 |  | 743
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 4.450% [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Original issue date |  |  | Feb. 01, 2016 |  |
Debt Instrument, Maturity Date | [1] |  | Feb. 15, 2026 |  |
Debt Instrument, Interest Rate, Stated Percentage | [1] |  | 4.50% |  |
Debt and Capital Lease Obligations |  |  | $ 892 |  | $ 891
[1] | See the 2017 Form 10-K, including note 8, for additional information regarding the maturity and principal amortization provisions and interest rates relating to the Company's indebtedness.
[2] | Exclusive of accrued interest
[3] | In June 2018, the Company entered into an amendment to the Credit Facility to (1) increase commitments on the 2016 Revolver by $750 million,for total 2016 Revolver commitments of $4.25 billion, and (2) extend the maturity of the Credit Facility from August 2022 to June 2023.
[4] | As of June 30, 2018, the undrawn availability under the 2016 Revolver was $3.9 billion.
[5] | In January 2018, the Company issued $750 million aggregate principal amount of 3.150% senior unsecured notes due July 2023 ("3.15% Senior Notes") and $1.0 billion aggregate principal amount of 3.800% senior unsecured notes due February 2028 ("3.80% Senior Notes") (collectively, "January 2018 Senior Notes Offering"). The Company used the net proceeds of the January 2018 Senior Notes Offering to repay (1) in full the January 2010 Tower Revenue Notes and (2) a portion of the outstanding borrowings under the 2016 Revolver.
[6] | If the respective series of such debt is not paid in full on or prior to an applicable date, then Excess Cash Flow (as defined in the indenture) of the issuers of such notes will be used to repay principal of the applicable series, and additional interest (of an additional approximately 5% per annum) will accrue on the respective series. See the 2017 Form 10-K for additional information regarding these provisions.
[7] | See note 13 for more information regarding the Company's July 2018 Tower Revenue Notes (as defined in note 13).

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