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Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Discontinued Operations [Line Items]      
Taxes on income at U.S. federal statutory rate $ 661 $ 676 $ 836
State and local taxes, net of federal tax benefit 116 116 109
Effect of foreign operations (98) (49) (108)
Noncontrolling interests (52) (2) (1)
U.K. statutory rate change (100) 0 0
Reorganization of foreign operations 0 (768) 0
Bankruptcy of an investee 0 (39) 0
Impact of tax law changes 0 0 (80)
Tax benefits from positions relating to the Tax Reform Act 0 (44) 0
Merger related costs 0 41 0
Establishment (reversal) of valuation allowance 0 (2) 153
Excess tax benefits from stock-based compensation 29 20 8
Domestic production deduction 0 (1) 24
Tax accounting method change 0 0 (78)
Other, net (21) 19 23
Provision (benefit) for income taxes $ 535 $ (29) 580
CBS Television City [Member]      
Discontinued Operations [Line Items]      
Establishment (reversal) of valuation allowance     $ 140