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Change in Accounting Principles (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Liability	$ 932
Accumulated Other Comprehensive Income (Loss), Net of Tax	(5,357)		$ (6,063)	$ (5,518)	$ (6,193)
Retained Earnings (Accumulated Deficit)	$ 39,742		34,010
Accounting Standards Update 2016-02 (Topic 842) [Member] \| Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		$ 998
ASU 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax		(6,103)
Retained Earnings (Accumulated Deficit)		34,050
ASU 2018-02 [Member] \| ScenarioPreviouslyReportedMember [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated Other Comprehensive Income (Loss), Net of Tax			(6,063)
Retained Earnings (Accumulated Deficit)			$ 34,010
ASU 2018-02 [Member] \| Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating Lease, Right-of-Use Asset		998
Operating Lease, Liability		998
Accumulated Other Comprehensive Income (Loss), Net of Tax		(40)
Retained Earnings (Accumulated Deficit)		$ 40