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Income Tax Reconciliation of the tax provision at the U.S. Federal Statutory Rate (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Contingency [Line Items] |  |  |
Tax provision at the U.S. federal statutory rate, Amount | $ 4,356 | $ 3,776 | $ 3,348
Tax provision at the U.S. federal statutory rate, Percent | 21.00% | 21.00% | 21.00%
State income taxes, net of federal benefit, Amount | $ 315 | $ 271 | $ 168
State income taxes, net of federal benefit, Percent | 1.50% | 1.50% | 1.00%
Share-based awards - excess tax benefit, Amount | $ (130) | $ (132) | $ (161)
Share-based awards - excess tax benefit, Percent | (0.60%) | (0.70%) | (1.00%)
Non-deductible compensation, Amount | $ 134 | $ 119 | $ 117
Non-deductible compensation, Percent | 0.70% | 0.70% | 0.70%
Health insurance tax, Amount | $ 626 | $ 0 | $ 552
Health insurance tax, Percent | 3.00% | 0.00% | 3.50%
Foreign rate differential, Amount | $ (164) | $ (214) | $ (203)
Foreign rate differential, Percent | (0.80%) | (1.20%) | (1.30%)
Other, net, Amount | $ (164) | $ (78) | $ (259)
Other, net, Percent | (0.80%) | (0.50%) | (1.60%)
Total provision for income taxes | $ 4,973 | $ 3,742 | $ 3,562
Provision for income taxes, Percent | 24.00% | 20.80% | 22.30%

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