Debt and Other Obligations Contractual Maturities (Details) - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018
Contractual Maturities [Abstract]
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	[1]	$ 552
Long-term Debt, Maturities, Repayments of Principal in Year Two		98
Long-term Debt, Maturities, Repayments of Principal in Year Three		1,672
Long-term Debt, Maturities, Repayments of Principal in Year Four		998
Long-term Debt, Maturities, Repayments of Principal in Year Five		3,602
Long-term Debt, Maturities, Repayments of Principal after Year Five		10,759
Total Cash Obligations		17,681
Unamortized Adjustments, Net		(112)
Debt and Finance Lease Obligations		$ 17,569	$ 16,682

[1] Predominantly consists of outstanding indebtedness under the Company's CP Program. Such amounts may be issued, repaid, or re-issued from time to time.